6.0.0-alpha.1

• Feat: Use float instead of Date for protocol types for higher precision (#1737)
• Ref: Bind external properties to a dedicated class. (#1750)
• Ref: Debug log serializable objects (#1795)
• Ref: catch Throwable instead of Exception to suppress internal SDK errors (#1812)

Breaking changes:

• SentryOptions can merge properties from ExternalOptions instead of another instance of SentryOptions
• Following boolean properties from SentryOptions that allowed null values are now not nullable - debug, enableUncaughtExceptionHandler, enableDeduplication
• SentryOptions cannot be created anymore using PropertiesProvider with SentryOptions#from method. Use ExternalOptions#from instead and merge created object with SentryOptions#merge
• Feat: Vendor JSON (#1554)
  • Introduce JsonSerializable and JsonDeserializer interfaces for manual json
    serialization/deserialization.
  • Introduce JsonUnknwon interface to preserve unknown properties when deserializing/serializing
    SDK classes.
  • When passing custom objects, for example in Contexts, these are supported for serialization:
    • JsonSerializable
    • Map, Collection, Array, String and all primitive types.
    • Objects with the help of refection.
      • Map, Collection, Array, String and all primitive types.
      • Call toString() on objects that have a cyclic reference to a ancestor object.
      • Call toString() where object graphs exceed max depth.
  • Remove gson dependency.
  • Remove IUnknownPropertiesConsumer
• Bump: Kotlin to 1.5 and compatibility to 1.4 for sentry-android-timber (#1815)