Add a RemMixed trait and impl for Uints #1986

Job	Run time
clippy	19s
build-benchmarks	48s
build (1.83.0, thumbv7em-none-eabi)	1m 52s
careful	1m 40s
build (1.83.0, wasm32-unknown-unknown)	1m 44s
build (stable, thumbv7em-none-eabi)	1m 56s
doc	32s
cross (aarch64-unknown-linux-gnu, stable)	2m 11s
build (stable, wasm32-unknown-unknown)	1m 39s
cross (powerpc-unknown-linux-gnu, stable)	1m 57s
miri (x86_64-unknown-linux-gnu)	4m 25s
miri (s390x-unknown-linux-gnu)	4m 39s
minimal-versions	38s
rustfmt	12s
test (i686-unknown-linux-gnu, 1.83.0, sudo apt update && sudo apt install gcc-multilib)	1m 32s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 29s
test (x86_64-unknown-linux-gnu, 1.83.0)	1m 28s
test (x86_64-unknown-linux-gnu, stable)	1m 33s
	30m 34s

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