200: Move typescript to dependencies r=curquiza a=Strift

## why

- fix build to allow deploying v0.3.0

## how

- move `typescript` to dependencies

note: Google is unclear about it, but it seems that dev dependencies are not installed, as I see other projects including typescript as part of their dependencies (see [stripe-firebase-extensions](https://github.com/invertase/stripe-firebase-extensions/blob/next/firestore-stripe-invoices/functions/package.json))

```
firebase ext:dev:upload meilisearch/firestore-meilisearch

Extension: meilisearch/firestore-meilisearch
State: Published
Latest Version: 0.1.12
Version in Extensions Hub: 0.1.12
Source in GitHub: Local source

? Enter the GitHub repo URI where this extension's source code is located: https://github.com/meilisearch/firestore-meilisearch
? Enter this extension's root directory in the repo (defaults to previous root if set): /
? Enter the commit hash, branch, or tag name to build from in the repo: HEAD
Validating source code at https://github.com/meilisearch/firestore-meilisearch/tree/HEAD/...
? Choose the release stage: Stable (0.3.0, automatically sent for review)

You are about to upload a new version to Firebase's registry of extensions.

Extension: meilisearch/firestore-meilisearch
Version: 0.3.0 (automatically sent for review)
Source: https://github.com/meilisearch/firestore-meilisearch/tree/HEAD/
Release notes:
Breaking: Update nodejs runtime to node20 (#179) `@brunoocasali`

Once an extension version is uploaded, it becomes installable by other users and cannot be changed. If you wish to make changes after uploading, you will need to upload a new version.

? Do you wish to continue? Yes
✖ Uploading meilisearch/[email protected]...

Error: generic::invalid_argument: failed to build ExtensionVersion "publishers/meilisearch/extensions/firestore-meilisearch/versions/0.3.0" source: failed to build NPM package:
Pulling image: us-docker.pkg.dev/extensions-builder-prod/extensions-builder/builder
Using default tag: latest
latest: Pulling from extensions-builder-prod/extensions-builder/builder
3153aa388d02: Pulling fs layer
ef57089adb55: Pulling fs layer
792066ee936e: Pulling fs layer
9ed9b1b2bc55: Pulling fs layer
9ed9b1b2bc55: Waiting
3153aa388d02: Verifying Checksum
3153aa388d02: Download complete
9ed9b1b2bc55: Verifying Checksum
9ed9b1b2bc55: Download complete
ef57089adb55: Download complete
792066ee936e: Verifying Checksum
792066ee936e: Download complete
3153aa388d02: Pull complete
ef57089adb55: Pull complete
792066ee936e: Pull complete
9ed9b1b2bc55: Pull complete
Digest: sha256:3f9b4d6c7b66b5859a7d894cd23d8ddcf78a23dcee2959a79ef99a5c8c41b81b
Status: Downloaded newer image for us-docker.pkg.dev/extensions-builder-prod/extensions-builder/builder:latest
us-docker.pkg.dev/extensions-builder-prod/extensions-builder/builder:latest
Now using node v20.4.0 (npm v9.7.2)

> [email protected] build
> tsc

sh: 1: tsc: not found
```

Co-authored-by: Strift <[email protected]>

202: Remove jest types from tsconfig r=curquiza a=Strift

# Pull Request

## Related issue

Error when publishing the extension

```

Extension: meilisearch/firestore-meilisearch
State: Published
Latest Version: 0.1.12
Version in Extensions Hub: 0.1.12
Source in GitHub: Local source

? Enter the GitHub repo URI where this extension's source code is located: https://github.com/meilisearch/firestore-meilisearch
? Enter this extension's root directory in the repo (defaults to previous root if set): /
? Enter the commit hash, branch, or tag name to build from in the repo: HEAD
Validating source code at https://github.com/meilisearch/firestore-meilisearch/tree/HEAD/...
? Choose the release stage: Stable (0.3.0, automatically sent for review)

You are about to upload a new version to Firebase's registry of extensions.

Extension: meilisearch/firestore-meilisearch
Version: 0.3.0 (automatically sent for review)
Source: https://github.com/meilisearch/firestore-meilisearch/tree/HEAD/
Release notes:
Breaking: Update nodejs runtime to node20 (#179) `@brunoocasali`

Once an extension version is uploaded, it becomes installable by other users and cannot be changed. If you wish to make changes after uploading, you will need to upload a new version.

? Do you wish to continue? Yes
✖ Uploading meilisearch/[email protected]...

Error: generic::invalid_argument: failed to build ExtensionVersion "publishers/meilisearch/extensions/firestore-meilisearch/versions/0.3.0" source: failed to build NPM package:
Pulling image: us-docker.pkg.dev/extensions-builder-prod/extensions-builder/builder
Using default tag: latest
latest: Pulling from extensions-builder-prod/extensions-builder/builder
3153aa388d02: Pulling fs layer
ef57089adb55: Pulling fs layer
792066ee936e: Pulling fs layer
9ed9b1b2bc55: Pulling fs layer
9ed9b1b2bc55: Waiting
3153aa388d02: Verifying Checksum
3153aa388d02: Download complete
9ed9b1b2bc55: Verifying Checksum
9ed9b1b2bc55: Download complete
ef57089adb55: Download complete
792066ee936e: Verifying Checksum
792066ee936e: Download complete
3153aa388d02: Pull complete
ef57089adb55: Pull complete
792066ee936e: Pull complete
9ed9b1b2bc55: Pull complete
Digest: sha256:3f9b4d6c7b66b5859a7d894cd23d8ddcf78a23dcee2959a79ef99a5c8c41b81b
Status: Downloaded newer image for us-docker.pkg.dev/extensions-builder-prod/extensions-builder/builder:latest
us-docker.pkg.dev/extensions-builder-prod/extensions-builder/builder:latest
Now using node v20.4.0 (npm v9.7.2)

> [email protected] build
> tsc

error TS2688: Cannot find type definition file for 'jest'.
  The file is in the program because:
    Entry point of type library 'jest' specified in compilerOptions
```

## What does this PR do?
- Move `jest` types to `functions/__tests__/tsconfig.json`
- Fix ensuing type errors

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: Strift <[email protected]>