Add tests and documentation for IdMap module #294

Job	Run time
nix simple cabal shell.nix / ubuntu-latest	17m 51s
nix flakes / ubuntu-latest	4m 42s
cabal / ghc-8.10.7 / ubuntu-22.04	24m 10s
nix / ubuntu-latest	4m 42s
cabal / ghc-9.0.2 / ubuntu-22.04	21m 31s
stack --stack-yaml ./stack.yaml / ubuntu-22.04	20m 53s
cabal / ghc-9.2.8 / ubuntu-22.04	21m 26s
stack --stack-yaml ./stack.yaml / ubuntu-20.04	18m 49s
stack --stack-yaml ./stack-nightly.yaml / ubuntu-22.04	22m 3s
cabal / ghc-9.4.7 / ubuntu-22.04	17m 33s
stack --stack-yaml ./stack-nightly.yaml / ubuntu-20.04	20m 41s
cabal / ghc-8.10.7 / ubuntu-20.04	19m 25s
cabal / ghc-9.0.2 / ubuntu-20.04	20m 47s
cabal / ghc-9.2.8 / ubuntu-20.04	19m 14s
cabal / ghc-9.4.7 / ubuntu-20.04	16m 16s
	4h 30m 3s

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