Proto commits in connectrpc/examples-go

These 4 commits are when the Protocol Buffers files have changed:

Commit:8bde2b9
Author:Sam Small
Committer:GitHub

Update copyright (#134) - Update to use "The Connect Authors" instead of "Buf Technologies, Inc." - Update copyright years from 2022 to 2022-2023

The documentation is generated from this commit.

Commit:b68eb35
Author:Akshay Shah
Committer:GitHub

Mark ElizaService.Say idempotent (#126) Say is free of side effects and perfectly safe to cache, so we should mark it idempotent. This also lets us demo HTTP GETs.

Commit:a41bded
Author:Akshay Shah
Committer:GitHub

Shorten protobuf package names (#123) This PR changes the protobuf package structure to better fit the project's new home: * It drops the `buf` prefix. * It changes `connect` to `connectrpc`, because `connect` isn't usable as a C++ namespace. * It drops `demo`, because it's pure categorization and makes already-long HTTP paths even longer. Along the way, we update the Buf CLI and clean up the Makefile a bit.

Commit:e77db05
Author:Akshay Shah
Committer:Josh Humphries

Initial commit