merge_pr_53706

Add Spanish and Japanese support; Add canonicalization & validation.

1. Enables Spanish and Japanese as a supported language in the browser
   process for Prompt and Summarizer APIs.
2. Adds Feature Params for kAISummarizationAPI and kAIPromptAPI
   to control enabled languages.
3. Adds validation and canonicalization of language tags for
   expectedInputs and expectedOutputs in LanguageModel availability()
   and create(). Adds web platform tests to test the behavior.

Bug: 422210273, 422211699
Change-Id: I35d152e05119382ce156c715c72d297de59c210d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6628446
Reviewed-by: Mike Wasserman [email protected]
Commit-Queue: Brad Triebwasser [email protected]
Cr-Commit-Position: refs/heads/main@{#1485302}