cipher: allow getting the proto of a ciphersuite #1622

Job	Run time
Windows CMake, Debug configuration (aws-lc-rs)	1m 52s
Windows CMake, Debug configuration (ring)	1m 39s
Build+test (clang, aws-lc-rs, stable, ubuntu-latest)	2m 28s
Build+test (clang, aws-lc-rs, beta, ubuntu-latest)	2m 22s
Build+test (clang, aws-lc-rs, nightly, ubuntu-latest)	2m 23s
Windows CMake, Release configuration (aws-lc-rs)	3m 52s
Build+test (clang, aws-lc-rs, 1.64.0, ubuntu-latest)	4m 26s
Windows CMake, Release configuration (ring)	2m 26s
Build+test (clang, ring, stable, ubuntu-latest)	1m 40s
Build+test (clang, ring, beta, ubuntu-latest)	1m 26s
Valgrind	2m 44s
Build+test (clang, ring, nightly, ubuntu-latest)	1m 23s
Clang Tidy	8s
Build+test (clang, ring, 1.64.0, ubuntu-latest)	3m 34s
Clippy	48s
Check for documentation errors	30s
Build+test (gcc, aws-lc-rs, stable, ubuntu-latest)	2m 5s
Build+test (gcc, aws-lc-rs, beta, ubuntu-latest)	2m 0s
Build+test (gcc, aws-lc-rs, nightly, ubuntu-latest)	1m 58s
Clippy nightly (optional)	43s
ensure-header-updated	1m 22s
Format	18s
Build+test (gcc, aws-lc-rs, 1.64.0, ubuntu-latest)	4m 18s
Build+test (gcc, ring, stable, ubuntu-latest)	1m 19s
Miri	1m 4s
Build+test (gcc, ring, beta, ubuntu-latest)	1m 21s
Check minimum versions	1m 24s
Build+test (gcc, ring, nightly, ubuntu-latest)	1m 16s
Build+test (gcc, ring, 1.64.0, ubuntu-latest)	3m 34s
Build+test (macos-latest, clang, aws-lc-rs, stable)	3m 11s
	59m 34s

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