LiveView Native Clients: 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
• visionOS Support rust-lang/libc#3568
• Added visionos support kornelski/rust-security-framework#201
• Added visionos target support sfackler/rust-native-tls#294
• Support Apple Vision Pro sonos/dinghy#223
• Add tvOS for apple silicon and add xcframework release ci #46 but for visionOS/xrOS
• Update libc to 0.2.155 rust-lang/rust#124560
• Update version to 0.2.155 rust-lang/libc#3682
• Re-add posix_spawn{_file_actions_t,attr_t} on Android rust-lang/libc#3683

Note: Developing for visionOS requires a Mac with Apple silicon. and so there won't be free CI from GitHub as they do not have free M1 GitHub runners for open source projects (yet).

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This issue is currently blocked by rust-lang/rust#121419

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Closed in #103 and #104.