Migrate to protobuf-py and rename repo to connect-py #810

Job	Run time
ci (highest, windows-2025, 3.10, nocov)	1m 10s
ci (lowest-direct, ubuntu-24.04, 3.10, nocov)	10m 44s
ci (highest, macos-15, 3.14, nocov)	7m 27s
ci (lowest-direct, macos-15, 3.14, nocov)	9m 47s
ci (highest, macos-15, 3.10, nocov)	7m 8s
ci (ubuntu-24.04, 3.14, cov, lowest-direct)	10m 53s
ci (lowest-direct, macos-15, 3.10, nocov)	9m 8s
ci (ubuntu-24.04, 3.12, nocov, lowest-direct)	10m 39s
ci (lowest-direct, ubuntu-24.04, 3.14, nocov)	10m 49s
ci (highest, ubuntu-24.04, 3.10, nocov)	10m 36s
ci (ubuntu-24.04, 3.13, nocov, lowest-direct)	6m 27s
ci (highest, windows-2025, 3.14, nocov)	1m 6s
ci (lowest-direct, windows-2025, 3.10, nocov)	1m 23s
ci (highest, ubuntu-24.04, 3.14, nocov)	10m 19s
ci (ubuntu-24.04, 3.11, nocov, lowest-direct)	9m 50s
ci (lowest-direct, windows-2025, 3.14, nocov)	44s
publish	8s
	1h 58m 18s

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