[shared-ui] Start subgraph work

[paullewis]

Working on #3788

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d902976f0286ed48c3c93ac0b48a0e8a0e38bd8f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | ------------------------------- | ----- | | @breadboard-ai/visual-editor | Patch | | @breadboard-ai/shared-ui | Patch | | @google-labs/breadboard-cli | Patch | | @google-labs/breadboard-website | Patch |

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