Add support for Predibase integration with header parsing

[use-tusk]

Fixes #2900

Updated the Predibase integration to support the following changes:

1. Updated the base URL from api.app.predibase.com to serving.app.predibase.com.
2. Added functionality to parse model and usage information from response headers before falling back to the response body. This includes parsing additional headers for token usage and request timings.
3. Created a new documentation file for setting up and integrating with Predibase, providing step-by-step instructions and code examples.

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[use-tusk]

@colegottdank please review this PR. If it's incorrect, close it with a comment explaining why to help me learn.

[use-tusk]

@colegottdank please review this PR. If it's incorrect, close it with a comment explaining why to help me learn.

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