feat(tree): Promote importConcise and exportConcise to beta

[Josmithr]

importConcise and exportConcise were previously available via TreeAlpha.
They may now be accessed via TreeBeta.

Also promotes related type definitions.

AB#50044

[Copilot]

Pull Request Overview

This pull request promotes the importConcise and exportConcise APIs from TreeAlpha to TreeBeta, making them available at the beta stability level. The PR also promotes related type definitions including ConciseTree, UnsafeUnknownSchema, TreeEncodingOptions, and KeyEncodingOptions to beta.

Key changes:

• Move importConcise and exportConcise methods from TreeAlpha to TreeBeta interface
• Update all test files and examples to use TreeBeta instead of TreeAlpha for these methods
• Promote related types from alpha to beta in API documentation and type definitions

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/dds/tree/src/simple-tree/api/treeBeta.ts	Adds importConcise and exportConcise method implementations to TreeBeta interface
packages/dds/tree/src/shared-tree/treeAlpha.ts	Removes importConcise and exportConcise methods from TreeAlpha interface
packages/dds/tree/src/simple-tree/unsafeUnknownSchema.ts	Updates UnsafeUnknownSchema type annotations from @Alpha to @beta
packages/dds/tree/src/simple-tree/api/customTree.ts	Updates TreeEncodingOptions and KeyEncodingOptions annotations from @Alpha to @beta
packages/dds/tree/src/simple-tree/api/conciseTree.ts	Updates ConciseTree type annotation from @Alpha to @beta
Multiple test files	Updates imports and method calls to use TreeBeta instead of TreeAlpha for concise operations
API report files	Reflects the promotion of types and methods from alpha to beta

[CraigMacomber]

A bunch of new code below here. Some PR comments noting which of this are moved and which are new would be helpful for review.

[Josmithr]

None of this is new - it was all copied from TreeAlpha. That said, I noticed that I inadvertently duplicated borrowCursorFromTreeNodeOrValue rather than move it here. I have no deduplicated it.

[Josmithr]

The "new" code would be what is now in TreeAlpha to maintain APIs for import/export there.

[CraigMacomber]

"must " in the PR description is out of date

[github-actions]

🔗 Found some broken links! 💔

Run a link check locally to find them. See
https://github.com/microsoft/FluidFramework/wiki/Checking-for-broken-links-in-the-documentation for more information.

linkcheck output

> [email protected] ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> [email protected] serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> [email protected] check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

 ELIFECYCLE  Command failed with exit code 1.