Add AutoFill CredentialProvider NSExtensionPoint support

[kiddailey]

This commit adds support for AutoFill Credential Provider extensions to be built. Specifically, this resolves the issue with unrecognized extension point warnings being issued during the build process for Credential Providers. A related change to Xamarin.MacDev has already been merged.

For more information, see posted issue at: #9000

[rolfbjarne]

build

[chamons]

Great stuff - thanks for the contribution!

[mandel-macaque]

Will backport this do d16-8 and will do an insertion with it so that is available ASAP.

[monojenkins]

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✅ API Diff (from stable)
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✅ Test run succeeded

[rolfbjarne]

Could you add an entry here too?

https://github.com/xamarin/xamarin-macios/blob/1b09465acf36b9311e202103aefe8c796482972d/Versions-ios.plist.in#L92-L136

This is used by the IDEs when listing the possible deployment targets for an extension.

With that addition this should be good to go.

[kiddailey]

Done and I think I've got it correct.

Thanks for pointing that out! I'm (slowly) gathering a list of missing extension points and am planning on putting in pull requests for those as well, so this definitely helps me make sure they're complete.

[rolfbjarne]

That's perfect!

[rolfbjarne]

build

[monojenkins]

Build failure
✅ Provisioning succeeded
✅ Build succeeded
✅ API Diff (from stable)
✅ API Diff (from PR only) (no change)
✅ Generator Diff (no change)
🔥 Test run failed 🔥

Test results

1 tests failed, 90 tests passed.

Failed tests

• monotouch-test/watchOS 32-bits - simulator/Debug: Failed Known issue: HE0038)