Rename product to Firebase AI - Part 1

[paulb777]

Source and SPM changes to update packages and classes consistent with Firebase AI SDK product naming

See individual commits for incremental transformations

[gemini-code-assist]

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[google-oss-bot]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)

Generated by 🚫 Danger

[paulb777]

/gemini review

[gemini-code-assist]

Code Review

The pull request renames the product to Firebase AI, updating packages and classes accordingly. The changes seem well-organized and consistent with the new naming convention. However, some areas could benefit from further clarification and potential improvements.

Summary of Findings

• Inconsistent naming in VertexAI.swift: The VertexAI class in VertexAI.swift still uses the old naming convention, which might be confusing for developers using the legacy module. Consider updating or deprecating this class to align with the new Firebase AI naming.
• Redundant API Config Assertions: The assertions for apiConfig.service and apiConfig.version in GenAI.swift seem redundant. Consider removing the duplicate assertion to simplify the code.
• Missing Documentation Update: The documentation in GenAI.swift still refers to Vertex AI for Firebase. Update the documentation to reflect the new Firebase AI naming.

Merge Readiness

The pull request is almost ready for merging. However, addressing the inconsistent naming in VertexAI.swift and updating the documentation in GenAI.swift would improve the overall clarity and consistency of the codebase. I am unable to approve this pull request, and recommend that these changes be reviewed and approved by others before merging.

[paulb777]

Done in other PRs