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Make protobuf metadata fields crate-private #14590

Job	Run time
Rust publish dry-run	35s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=40385044138/runner=arm64-medium/imag...	1m 15s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=40385044138/runner=amd64-medium/image...	1m 53s
Python (wheel build)	7m 20s
Compat check / compat-test	5m 27s
	16m 30s