Concurrent `kore-rpc` server (#3704) #728

Job	Run time
Cache Cabal (ubuntu-22.04, ubuntu-22.04, x86_64-linux)	14m 56s
Release	7m 14s
Cache Cabal (macos-12, macos-12, x86_64-darwin)	24m 19s
Cache Stack	11m 25s
Cache Stack Haddock	5m 2s
Cache Cabal (MacM1, self-macos-12, aarch64-darwin)	5m 45s
Publish Release	2s
	1h 8m 43s

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