Rename Parser to OptionRegistrar #24606

Job	Run time
Classify changes	6s
Bootstrap Pants, test Rust (macOS12-x86_64)	3m 34s
Bootstrap Pants, test and lint Rust (Linux-x86_64)	2m 39s
Build wheels (Linux-x86_64)	0s
Build wheels (Linux-ARM64)	0s
Build wheels (macOS10-15-x86_64)	0s
Ensure PR has release notes	2s
Build wheels (macOS11-ARM64)	0s
Bootstrap Pants, test Rust (Linux-ARM64)	1m 46s
Test Python (Linux-ARM64)	7m 53s
Test Python (Linux-x86_64) Shard 1/10	16m 48s
Test Python (Linux-x86_64) Shard 0/10	17m 39s
Lint Python and Shell	3m 33s
Test Python (Linux-x86_64) Shard 3/10	15m 36s
Test Python (Linux-x86_64) Shard 2/10	16m 58s
Test Python (Linux-x86_64) Shard 4/10	26m 26s
Test Python (Linux-x86_64) Shard 6/10	10m 12s
Test Python (Linux-x86_64) Shard 7/10	14m 23s
Test Python (Linux-x86_64) Shard 5/10	13m 36s
Test Python (Linux-x86_64) Shard 8/10	14m 31s
Test Python (Linux-x86_64) Shard 9/10	10m 16s
Test Python (macOS12-x86_64)	14m 35s
Set Merge OK	1s
Merge OK	1s
	3h 10m 35s

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