v0.3.0

Implementation Changes

• Allow kwargs to be passed to create_channel (via synth). (#8425)

New Features

• Add 'options_' argument to clients' 'get_iam_policy'; pin black version (via synth). (#8654)
• Add 'client_options' support, update list method docstrings (via synth). (#8503)

Dependencies

• Bump minimum version for google-api-core to 1.14.0. (#8709)
• Update pin for 'grpc-google-iam-v1' to 0.12.3+. (#8647)

Documentation

• Add get_entry sample (via synth). (#8725)
• Link to googleapis.dev documentation in READMEs. (#8705)
• Add generated samples (via synth). (#8710)
• Add compatibility check badges to READMEs. (#8288)
• Update docstrings (via synth). (#8299)

Internal / Testing Changes

• Enable Sample Generator Tool for Data Catalog (#8708)
• Add docs job to publish to googleapis.dev. (#8464)