[AI] Refactor template models to reduce code duplication

[andrewheard]

WIP - Extracting duplicated code from TemplateGenerativeModel and TemplateChatSession in preparation for adding function calling support. There is significant overlap with GenerativeModel and Chat, in particular the stream handling and part aggregation. This also unifies the error handling (wrapping in GenerateContentError) so that they behave similarly.

TODO:

• Extract GenerateContentRequest to re-use in TemplateChatSession.sendMessage(_:request:).
• Consider making GenerativeModel and/or Chat generic (with a new name and adding a typealias to avoid a breaking change) to simplify code re-use.

#no-changelog

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