feat: [google-ai-generativelanguage] Add content caching

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BEGIN_COMMIT_OVERRIDE
feat: Add content caching
feat: Add cached_content_token_count to generative_service's UsageMetadata
feat: Add cached_content_token_count to CountTokensResponse
docs: Small fixes
END_COMMIT_OVERRIDE

PiperOrigin-RevId: 642001790

Source-Link: googleapis/googleapis@804ed3e

Source-Link: https://github.com/googleapis/googleapis-gen/commit/cefe39f5e9a45ad82639a08e0231488406e1b6b9
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWFpLWdlbmVyYXRpdmVsYW5ndWFnZS8uT3dsQm90LnlhbWwiLCJoIjoiY2VmZTM5ZjVlOWE0NWFkODI2MzlhMDhlMDIzMTQ4ODQwNmUxYjZiOSJ9

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Here is the summary of changes.

You are about to add 10 region tags.

• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_create_cached_content_async.py:26, tag generativelanguage_v1beta_generated_CacheService_CreateCachedContent_async
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_create_cached_content_sync.py:26, tag generativelanguage_v1beta_generated_CacheService_CreateCachedContent_sync
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_delete_cached_content_async.py:26, tag generativelanguage_v1beta_generated_CacheService_DeleteCachedContent_async
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_delete_cached_content_sync.py:26, tag generativelanguage_v1beta_generated_CacheService_DeleteCachedContent_sync
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_get_cached_content_async.py:26, tag generativelanguage_v1beta_generated_CacheService_GetCachedContent_async
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_get_cached_content_sync.py:26, tag generativelanguage_v1beta_generated_CacheService_GetCachedContent_sync
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_list_cached_contents_async.py:26, tag generativelanguage_v1beta_generated_CacheService_ListCachedContents_async
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_list_cached_contents_sync.py:26, tag generativelanguage_v1beta_generated_CacheService_ListCachedContents_sync
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_update_cached_content_async.py:26, tag generativelanguage_v1beta_generated_CacheService_UpdateCachedContent_async
• packages/google-ai-generativelanguage/samples/generated_samples/generativelanguage_v1beta_generated_cache_service_update_cached_content_sync.py:26, tag generativelanguage_v1beta_generated_CacheService_UpdateCachedContent_sync

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