8.21.0

Features

• Add support for Sentry Spotlight (#3642), which is basically Sentry
  for development. Read our blog post to find out more.
• Add field SentrySDK.detectedStartUpCrash (#3644)
• Automatically profile app launches (#3529)
• Use CocoaPods resource_bundles for PrivacyInfo (#3651)
• Make tags of SentryScope public (#3650)

Improvements

• Cache installationID async to avoid file IO on the main thread when starting the SDK (#3601)
• Add reason for NSPrivacyAccessedAPICategoryFileTimestamp (#3626)

Fixes

• Finish TTID span when transaction finishes (#3610)
• Don't take screenshot and view hierarchy for app hanging (#3620)
• Remove free_storage and storage_size from the device context (#3627), because Apple forbids sending
  information retrieved via NSFileSystemFreeSize and NSFileSystemSize off a device; see
  Apple docs.
• Make SentryFramesTracker available for HybridSDKs (#3683)
• Make SentrySwizzle available for HybridSDKs (#3684)
• Move headers reference out of "extern C" (#3690)