proto: Pass `ConnectionId` by value internally #5290

Job	Run time
test on illumos	6m 51s
test on freebsd	4m 16s
audit	22s
lint	1m 42s
msrv	1m 7s
test (ubuntu-latest, stable)	1m 33s
test (ubuntu-latest, beta)	1m 25s
test-android (x86_64-linux-android, x86_64, 26)	2m 45s
test-aws-lc-rs	1m 56s
test (macos-latest, stable)	1m 10s
test-android (x86_64-linux-android, x86_64, 25)	2m 34s
test on netbsd	4m 55s
test (windows-latest, stable)	2m 54s
test-android (i686-linux-android, x86, 26)	2m 45s
test on solaris	6m 28s
test wasm32-unknown-unknown	1m 6s
features (ubuntu-latest)	1h 22m 22s
test-android (i686-linux-android, x86, 25)	2m 38s
features (macos-latest)	24m 21s
features (windows-latest)	48m 58s
	3h 22m 8s

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