feat: add session based protocol

[gcf-owl-bot]

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docs: update various comments
PiperOrigin-RevId: 896559755

Source-Link: googleapis/googleapis@d667775

Source-Link: https://github.com/googleapis/googleapis-gen/commit/f5d557e572135751a9279913e44508a3607edf3a
Copy-Tag: eyJwIjoiZ29vZ2xlLWNsb3VkLWJpZ3RhYmxlLXYyLy5Pd2xCb3QueWFtbCIsImgiOiJmNWQ1NTdlNTcyMTM1NzUxYTkyNzk5MTNlNDQ1MDhhMzYwN2VkZjNhIn0=

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• google-cloud-bigtable-v2/snippets/bigtable/get_client_configuration.rb:19, tag bigtable_v2_generated_Bigtable_GetClientConfiguration_sync
• google-cloud-bigtable-v2/snippets/bigtable/open_authorized_view.rb:19, tag bigtable_v2_generated_Bigtable_OpenAuthorizedView_sync
• google-cloud-bigtable-v2/snippets/bigtable/open_materialized_view.rb:19, tag bigtable_v2_generated_Bigtable_OpenMaterializedView_sync
• google-cloud-bigtable-v2/snippets/bigtable/open_table.rb:19, tag bigtable_v2_generated_Bigtable_OpenTable_sync

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