feat(ts#rdb): add relational database support

[AlexTo]

Reason for this change

Currently, nx-plugin-for-aws provides generators for vending APIs, but it does not yet support generators for vending databases.
There are reference implementations available, such as the Prisma + Lambda CDK example:
https://github.com/aws-samples/prisma-lambda-cdk
However, adapting these examples to our framework comes with a few gotchas:

• Ensuring the ORM client is automatically regenerated during the build process
• Managing infrastructure required for database migrations
• Enabling APIs to properly connect to RDB packages
• Defining Nx targets that make it easy to work with one or multiple databases

Description of changes

• Create a new ts#rdb generator to generate a Typescript database project
• Provide documentation on how to use the generator

Description of how you validated changes

• Unit tests
• Manual testing
  • Generate an RDB package using CDK with Aurora PostgreSQL, along with a tRPC API package. Deploy it to AWS and verify that the resources are created correctly, migrations run successfully, and the API can connect to the database.
  • Generate an RDB package using CDK with Aurora MySQL, along with a tRPC API package. Deploy it to AWS and verify that the resources are created correctly, migrations run successfully, and the API can connect to the database.

Issue # (if applicable)

Closes #485 .

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.11111% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.38%. Comparing base (c152caa) to head (36e32f7).

Files with missing lines	Patch %	Lines
packages/nx-plugin/src/ts/rdb/generator.ts	93.33%	1 Missing and 1 partial ⚠️
...-plugin/src/utils/rdb-constructs/rdb-constructs.ts	86.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #552      +/-   ##
==========================================
+ Coverage   89.35%   89.38%   +0.02%     
==========================================
  Files          94       96       +2     
  Lines        3166     3211      +45     
  Branches      701      708       +7     
==========================================
+ Hits         2829     2870      +41     
- Misses        156      158       +2     
- Partials      181      183       +2     

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