Refactor StreamJoinMetrics to reuse BaselineMetrics (#16674) #28

Job	Run time
linux build test	4m 51s
cargo test hash collisions (amd64)	24m 56s
Run sqllogictests with the sqlite test suite	2h 11m 42s
cargo test 'extended_tests' (amd64)	24m 16s
update-check-status	0s
	3h 5m 45s

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