Support visionOS/xrOS

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There are a couple things required for this:

• Add support for visionOS targets rust-lang/compiler-team#642 and subsequent work
• watchOS and tvOS support kornelski/rust-security-framework#190 but for visionOS/xrOS
• Add tvOS and watchOS support sfackler/rust-native-tls#285 but for visionOS/xrOS
• Add tvOS for apple silicon and add xcframework release ci #46 but for visionOS/xrOS

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I think my browser had an issue when I authored this and this is a dupe of #70.