feat: add PlatformImpl trait for custom platform callbacks #7094

Job	Run time
asan aarch64-apple-darwin	19m 47s
release aarch64-pc-windows-msvc	11m 57s
debug aarch64-apple-darwin ptrcomp	2m 57s
release x86_64-unknown-linux-gnu	1m 29s
debug x86_64-unknown-linux-gnu	1m 23s
release aarch64-apple-darwin	2m 57s
release x86_64-unknown-linux-gnu ptrcomp	2m 36s
debug x86_64-apple-darwin ptrcomp	3m 8s
debug x86_64-unknown-linux-gnu ptrcomp	1m 26s
release x86_64-apple-darwin	3m 1s
release x86_64-pc-windows-msvc	1s
debug x86_64-apple-darwin	3m 7s
debug aarch64-apple-darwin	2m 57s
release x86_64-apple-darwin ptrcomp	3m 16s
release aarch64-unknown-linux-gnu	1m 40s
release aarch64-apple-darwin ptrcomp	2m 56s
debug aarch64-unknown-linux-gnu	1m 35s
test aarch64-pc-windows-msvc	4m 16s
publish	0s
	1h 10m 29s

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