[metrohash] support iOS triplets

[luncliff]

What does your PR fix?

This is an enhancement of #15715

Which triplets are supported/not supported? Have you updated the CI baseline?

Support 4 ios triplets

• arm64-ios
• arm-ios
• x64-ios
• x86-ios

$ ./vcpkg install metrohash:arm64-ios metrohash:arm-ios metrohash:x64-ios metrohash:x86-ios
...

The package metrohash:arm-ios provides CMake targets:

    find_package(metrohash CONFIG REQUIRED)
    target_link_libraries(main PRIVATE metrohash::metrohash)

The package metrohash:arm64-ios provides CMake targets:

    find_package(metrohash CONFIG REQUIRED)
    target_link_libraries(main PRIVATE metrohash::metrohash)

The package metrohash:x64-ios provides CMake targets:

    find_package(metrohash CONFIG REQUIRED)
    target_link_libraries(main PRIVATE metrohash::metrohash)

The package metrohash:x86-ios provides CMake targets:

    find_package(metrohash CONFIG REQUIRED)
    target_link_libraries(main PRIVATE metrohash::metrohash)

Does your PR follow the maintainer guide?

Yes

• Versioning
  • "port-version" update
  • Update the version files in versions/
• Code format
  • Manifests

[ras0219-msft]

Sweet, LGTM. Thanks for the fixes!