Core

• Update auth snippets

Text-to-Speech

• Add texttospeech module (initial release) (#3075)

Pub/Sub

• Update code examples (#3059)
• Delete getSubscriptionName (#3060)

Bigtable

• Add tests for data resource headers (#3062)
• Implement integration tests (#2997)
• Copy InstanceName to data.models. (#3063)
• Resource Prefixes (#3050)

Logginig

• Add interface for enhancing Logback events (#2734)