Add support for Mac Catalyst

[jerryseigle]

Closes #

⚠️ Breaking changes ⚠️

• None.

Introduced changes

• This PR adds Mac Catalyst stubs and build flags so the iOS implementation can compile and run under Catalyst.
• It adds a runtime guard so creating an audio context does not crash when the worklets runtime is unavailable.
• For Expo + Catalyst builds, React-Core must be built as static libraries, and FFmpeg must be disabled until updated bindings are available.

PR notes

1. This change adds Mac Catalyst stubs and build flags so the iOS implementation can compile and run under Catalyst.
2. On the current main branch, the project could build but would crash at runtime when creating the audio context if the worklets runtime was unavailable. This PR adds a guard so that case no longer crashes.
3. For Expo + Catalyst, the Podfile must use static React-Core (not dynamic), otherwise the Catalyst build fails during linking.
4. For Catalyst builds, FFmpeg must be disabled in the app Podfile (for example DISABLE_AUDIOAPI_FFMPEG=1) until updated FFmpeg bindings are available.

⚠️ Help needed: Before moving forward, help is needed to create updated FFmpeg bindings that properly support Mac Catalyst.

Podfile example (for Expo + Catalyst)

ENV['DISABLE_AUDIOAPI_FFMPEG'] = '1'
ENV['RCT_USE_PREBUILT_RNCORE'] = '0'
ENV['RCT_USE_RN_DEP'] = '0'
ENV['RCT_BUILD_FROM_SOURCE'] = '1'

use_frameworks! :linkage => :static

post_install do |installer|
  react_native_post_install(
    installer,
    config[:reactNativePath],
    :mac_catalyst_enabled => true,
  )

  installer.pods_project.targets.each do |target|
    if target.name =~ /React|RCT|Yoga|hermes|cxxreact/i
      target.build_configurations.each do |config|
        config.build_settings['MACH_O_TYPE'] = 'staticlib'
        config.build_settings['SKIP_INSTALL'] = 'NO'
      end
    end
  end

  installer.pods_project.targets.each do |pod_target|
    next unless ['RNAudioAPI', 'Pods-myapp'].include?(pod_target.name)
    pod_target.build_configurations.each do |config|
      config.build_settings['OTHER_LDFLAGS[sdk=macosx*]'] = '$(inherited)'
    end
  end
end