compiler: Log metrics on pruned memo blocks/values #506

Job	Run time
Discover yarn workspaces	9s
Lint babel-plugin-react-compiler	1m 20s
Jest babel-plugin-react-compiler	2m 11s
Run prettier	1m 19s
Test make-read-only-util	1m 16s
Test snap	1m 19s
Test react-compiler-healthcheck	1m 20s
Test babel-plugin-react-compiler	1m 51s
Test eslint-plugin-react-compiler	1m 31s
Test react-compiler-runtime	1m 15s
	13m 31s

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