[Firebase AI] Make GenerativeAIRequest.Response Sendable

[andrewheard]

Updated the Response associated type for GenerativeAIRequest to require Sendable conformance. This resolves the warning Capture of non-sendable type 'T.Response.Type' in an isolated closure; this is an error in the Swift 6 language mode in Xcode 26 Beta 1.

Added Sendable conformance to CountTokensResponse and ImagenGenerationResponse<T> (and the two types used for T, ImagenInlineImage ImagenGCSImage).

#no-changelog

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[paulb777]

LGTM on good CI

[paulb777]

CI looks good.

Add a changelog like - Fixed Sendable warnings introduced with Xcode 26 beta