Rust

Add immutable map accessors to OccupiedEntry and VacantEntry #965

Job	Run time
miri	1m 52s
rustfmt_clippy	15s
basics	1s
msrv	3m 28s
dep_of_std	11s
test (ubuntu-latest, x86_64-unknown-linux-gnu, 1.74.0)	2m 19s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly)	3m 2s
test (ubuntu-latest, i686-unknown-linux-gnu, 1.74.0)	2m 9s
test (ubuntu-latest, i686-unknown-linux-gnu, nightly)	2m 23s
test (ubuntu-latest, i586-unknown-linux-gnu, 1.74.0)	2m 2s
test (ubuntu-latest, i586-unknown-linux-gnu, nightly)	2m 13s
test (ubuntu-latest, loongarch64-unknown-linux-gnu, 1.74.0)	1m 13s
test (ubuntu-latest, loongarch64-unknown-linux-gnu, nightly)	1m 11s
test (ubuntu-latest, armv7-unknown-linux-gnueabihf, 1.74.0)	3m 14s
test (ubuntu-latest, armv7-unknown-linux-gnueabihf, nightly)	4m 25s
test (ubuntu-latest, aarch64-unknown-linux-gnu, 1.74.0)	2m 55s
test (ubuntu-latest, aarch64-unknown-linux-gnu, nightly)	3m 25s
test (ubuntu-latest, thumbv6m-none-eabi, 1.74.0)	1m 9s
test (ubuntu-latest, thumbv6m-none-eabi, nightly)	1m 6s
test (macos-latest, aarch64-apple-darwin, nightly)	2m 32s
test (windows-latest, x86_64-pc-windows-msvc, nightly)	4m 48s
test (macos-latest, aarch64-apple-darwin, 1.74.0)	2m 41s
test (windows-latest, x86_64-pc-windows-msvc, 1.74.0)	3m 46s
test (ubuntu-latest, x86_64-unknown-linux-gnu, beta)	2m 7s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	2m 0s
conclusion	1s
	56m 28s

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