Improve tree-agent TS rendering

[noencke]

• Removed intermediate zod transformation from the main TS output computation. Some processing of zod is still necessary for methods and properties defined on the schema. These may be updated via an API change in a later PR.
• Factored TS rendering into its own file
• Readonly properties are now marked as readonly rather than merely having a "// readonly" comment
• Comments derived from metadata descriptions are now placed above members rather than after.

[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

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

Crawling...

Stats:
  250224 links
    1778 destination URLs
    2015 URLs ignored
       0 warnings
       0 errors