Add a RemMixed trait and impl for Uints #1996

Job	Run time
build-benchmarks	50s
careful	1m 36s
clippy	20s
build (1.83.0, thumbv7em-none-eabi)	1m 53s
build (1.83.0, wasm32-unknown-unknown)	1m 33s
cross (aarch64-unknown-linux-gnu, stable)	4m 3s
doc	34s
minimal-versions	40s
build (stable, thumbv7em-none-eabi)	1m 51s
cross (powerpc-unknown-linux-gnu, stable)	5m 37s
build (stable, wasm32-unknown-unknown)	1m 43s
miri (x86_64-unknown-linux-gnu)	6m 9s
rustfmt	12s
test (i686-unknown-linux-gnu, 1.83.0, sudo apt update && sudo apt install gcc-multilib)	2m 41s
miri (s390x-unknown-linux-gnu)	6m 23s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 51s
test (x86_64-unknown-linux-gnu, 1.83.0)	2m 3s
test (x86_64-unknown-linux-gnu, stable)	2m 6s
	43m 5s

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