feat: add PlatformImpl trait for custom platform callbacks #7099

Job	Run time
asan aarch64-apple-darwin	14m 25s
release aarch64-pc-windows-msvc	11m 0s
debug x86_64-apple-darwin ptrcomp	17m 13s
debug aarch64-apple-darwin	15m 3s
debug x86_64-unknown-linux-gnu	14m 47s
release x86_64-unknown-linux-gnu ptrcomp	8m 11s
release x86_64-unknown-linux-gnu	8m 17s
release x86_64-apple-darwin	12m 27s
debug x86_64-unknown-linux-gnu ptrcomp	15m 1s
debug aarch64-unknown-linux-gnu	28m 29s
debug aarch64-apple-darwin ptrcomp	14m 57s
release aarch64-unknown-linux-gnu	15m 4s
release aarch64-apple-darwin	12m 36s
release x86_64-pc-windows-msvc	10m 46s
release aarch64-apple-darwin ptrcomp	11m 6s
release x86_64-apple-darwin ptrcomp	12m 20s
debug x86_64-apple-darwin	16m 8s
test aarch64-pc-windows-msvc	6m 45s
publish	0s
	4h 4m 35s

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