[core-kit] Improve schema handling for runJavascript nodes

[aomarks]

• Adds inputSchema and outputSchema properties, to replace the now deprecated schema property (which is now the fallback for outputSchema).

• The code helper now automatically serializes both the input and output schemas.

• Fixes a bug relating to returning JSON Schema directly from describe, instead of wrapping it in unsafeSchema.

Fixes #2396
Fixes #2296

[changeset-bot]

🦋 Changeset detected

Latest commit: cd004e2

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

This PR includes changesets to release 9 packages

Name	Type
@google-labs/core-kit	Patch
@breadboard-ai/build	Patch
@google-labs/breadboard-cli	Patch
@google-labs/gemini-kit	Patch
@breadboard-ai/google-drive-kit	Patch
@google-labs/json-kit	Patch
@breadboard-ai/python-wasm	Patch
@google-labs/template-kit	Patch
@google-labs/visual-editor	Patch

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