feat: add viz by generating svg image

[marcusschiesser]

1. adds an interceptor to handle to create a graph of the workflow (using graphology as data structure)
2. graph can be returned using getGraph on a workflow generated with const workflow = withGraph(createWorkflow());
3. toSigma converts the graph into a graph that is renderable by https://www.sigmajs.org/
4. demo/visualization is an example to render a complex workflow (with sendEvent and filter) using sigma.js, result looks like:

[changeset-bot]

⚠️ No Changeset found

Latest commit: 20d14a6

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[himself65]

1. this should be a browser-compatable package
2. graphviz is not a good package to me. it doesn't drag node, and it's a static svg

[himself65]

All I want is exactly this, or I will not merge the PR

https://github.com/statelyai/xstate-viz

[github-actions]

Deployed at https://llamaindex-ts-60jbcnzr3.pr.staging.llamaindex.ai

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/run-llama/llama-flow/@llama-flow/core@67

npm i https://pkg.pr.new/run-llama/llama-flow/@llama-flow/http@67

npm i https://pkg.pr.new/run-llama/llama-flow/@llama-flow/llamaindex@67

npm i https://pkg.pr.new/run-llama/llama-flow/@llama-flow/viz@67

commit: 20d14a6

[marcusschiesser]

need to be latest after release

[himself65]

this looks better now