chore: Add example for TrackChat from the AI SDK

[jsonbailey]

Note

Adds a new packages/sdk/server-ai/examples/tracked-chat example and wires it into workspaces and release-please.

• Examples:
  • New packages/sdk/server-ai/examples/tracked-chat: Adds README, package.json, TypeScript sources (src/index.ts), and tsconfig.json demonstrating tracked AI chat via @launchdarkly/server-sdk-ai.
• Workspace:
  • Adds packages/sdk/server-ai/examples/tracked-chat to root package.json workspaces.
• Release automation:
  • Updates release-please-config.json to track @launchdarkly/server-sdk-ai dependency in examples/tracked-chat/package.json (and examples/vercel-ai/package.json).

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[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 169118 bytes
Compressed size limit: 200000
Uncompressed size: 789399 bytes

[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 24988 bytes
Compressed size limit: 26000
Uncompressed size: 122411 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 21721 bytes
Compressed size limit: 25000
Uncompressed size: 74698 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 17636 bytes
Compressed size limit: 20000
Uncompressed size: 90259 bytes

[jsonbailey]

The build will fail until we deploy the langchain-provider package.

[jsonbailey]

this one was previously missing so I added it in while adding the trackedchat.