Introduce set_custom_verify_callback and set_async_custom_verify_callback #653

Job	Run time
rustfmt	6s
clippy	56s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	6m 59s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	8m 24s
Test features	3m 19s
Test (stable)	2m 4s
Test FIPS integration	2m 50s
Test (macos-x86_64)	3m 35s
Test (arm-android)	2m 29s
Test (arm64-android)	2m 3s
Test (i686-android)	2m 18s
Test (x86_64-android)	2m 27s
Test (aarch64-ios)	4m 29s
Test (aarch64-ios-sim)	2m 49s
Test (x86_64-ios)	4m 26s
Test (i686-linux)	2m 6s
Test (arm-linux)	1m 56s
Test (aarch64-linux)	2m 7s
Test (x86_64-musl)	2m 19s
Test (x86_64-mingw)	2m 13s
Test (i686-msvc)	5m 20s
Test (x86_64-msvc)	5m 58s
	1h 11m 13s

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