Move and simplify Apple host TurboModule

[kraenhansen]

Merging this PR will:

• Rename the ios directory to apple as this code is generally applicable across Apple platforms, beyond iOS.
• Simplify the implementation to take advantage of the fact that we're supporting a very limited set of React Native versions, all of which have the ReactCommon/CxxTurboModuleUtils.h API available.

---

Note

Moves iOS host code to apple and simplifies the TurboModule provider to unconditionally use CxxTurboModuleUtils with +load registration.

• Apple host:
  • Move packages/host/ios to packages/host/apple; update podspec s.source_files to point to apple/**/*.
  • Simplify TurboModule provider:
    • Add packages/host/apple/NodeApiHostModuleProvider.mm using ReactCommon/CxxTurboModuleUtils.h and +load to register via registerCxxModuleToGlobalModuleMap.
    • Remove legacy conditional paths and bridge-based RCTTurboModule code from packages/host/ios/NodeApiHostModuleProvider.mm.
• Release:
  • Add changeset to publish a patch for react-native-node-api.

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