[AI] Enable Ktor logging for debug builds in firebase-ai

[rlazo]

This change enables network logging for debug variants of the firebase-ai SDK to facilitate development and debugging.

• Enable BuildConfig generation in firebase-ai.
• Install Ktor Logging plugin in APIController for debug builds, with header sanitization for security (X-Android-Cert, x-goog-api-key).
• Configure slf4j-simple for debug builds and slf4j-nop for release builds in firebase-ai.

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[rlazo]

/gemini review

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Code Review

This pull request refactors the logging setup for the firebase-ai module, enabling BuildConfig and introducing variant-specific logging dependencies: slf4j-nop for release builds and slf4j-simple for debug builds. It also integrates Ktor client logging, which is active only in debug builds and includes header sanitization for X-Android-Cert and x-goog-api-key. A review comment points out that the header sanitization logic currently uses a case-sensitive comparison, which should be updated to be case-insensitive to ensure all relevant headers are correctly sanitized.