[Firebase AI] Conform GroundingMetdata to Equatable

[andrewheard]

Added Equatable and Hashable conformance to GroundingMetadata and its transitively referenced types. See firebase/quickstart-ios#1724 (comment) for context. This is also considered a general good practice from Apple:

Conforming to the Equatable and Hashable protocols is straightforward and makes it easier to use your own types in Swift. It’s a good idea for all your custom model types to conform.
-- https://developer.apple.com/documentation/swift/adopting-common-protocols

Jules Prompt

Add Equatable and Hashable conformance to GroundingMetadata. You will need to add the conformances to all of the types that GroundingMetadata transitively references.

#no-changelog

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[ncooke3]

Thanks for sharing the prompt!

[andrewheard]

cc: @paulb777 to make sure you don't do this too.

Also self-reminder to delete https://github.com/firebase/quickstart-ios/blob/979388a9680d41114dfd9f74d52ba5fd8c148e13/firebaseai/ChatExample/Models/ChatMessage.swift#L34-L38 (and bump the minimum version of the firebase-ios-sdk dependency to 12.1) after the next release.