feat: add PlatformImpl trait for custom platform callbacks #7081

Job	Run time
release aarch64-pc-windows-msvc	11m 56s
asan aarch64-apple-darwin	22m 51s
debug aarch64-apple-darwin ptrcomp	14m 28s
release x86_64-apple-darwin ptrcomp	12m 41s
debug aarch64-unknown-linux-gnu	28m 48s
release x86_64-unknown-linux-gnu ptrcomp	8m 23s
debug aarch64-apple-darwin	16m 19s
release x86_64-pc-windows-msvc	9m 59s
debug x86_64-unknown-linux-gnu	14m 51s
release aarch64-apple-darwin	11m 4s
release aarch64-unknown-linux-gnu	15m 25s
debug x86_64-apple-darwin ptrcomp	17m 51s
release x86_64-apple-darwin	11m 17s
release x86_64-unknown-linux-gnu	7m 41s
debug x86_64-unknown-linux-gnu ptrcomp	15m 45s
debug x86_64-apple-darwin	16m 57s
release aarch64-apple-darwin ptrcomp	13m 31s
test aarch64-pc-windows-msvc	4m 11s
publish	0s
	4h 13m 58s

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