HashMap and HashSet #49

Job	Run time
Linting	15s
Test (ubuntu-latest)	19s
Test (ubuntu-latest, --release)	23s
Test (ubuntu-latest, --features=no_std)	18s
Test (ubuntu-latest, --features=no_std, --release)	17s
Test (windows-latest)	2m 6s
Test (windows-latest, --release)	2m 1s
Test (windows-latest, --features=no_std)	1m 7s
Test (windows-latest, --features=no_std, --release)	1m 41s
Test (macos-latest)	19s
Test (macos-latest, --release)	20s
Test (macos-latest, --features=no_std)	21s
Test (macos-latest, --features=no_std, --release)	23s
Test (macos-12)	32s
Test (macos-12, --release)	33s
Test (macos-12, --features=no_std)	34s
Test (macos-12, --features=no_std, --release)	32s
	12m 1s

Provide feedback