perf: coalesce batches before sending to distributor channels in Repa… #176

Job	Run time
Run sqllogictests with the sqlite test suite	44m 48s
linux build test	5m 30s
cargo test hash collisions (amd64)	10m 30s
cargo test 'extended_tests' (amd64)	32m 41s
	1h 33m 29s

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