Bluetooth: Separate enable and disable Reasons from package name

* Reasons to enable or disable Bluetooth should be in a separate
  namespace away from package names that initiated the enable or disable
* Delcare reason code in android/bluetooth/enums.proto as
  EnableDisableReasonEnum and use these reason code together with
  package names to log Bluetooth enable and disable events
* When reason is ENABLE_DISABLE_REASON_APPLICATION_REQUEST, the external
  package name is the real reason why Bluetooth is enabled or disabled
* Change START_CRASH to START_ERROR since it represents a disable event
  when Bluetooth failed to start
* Change UNEXPECTED_CRASH to CRASH since no crash is expected
* Add getEnableDisableReasonString() method to covert reason code to
  human readable strings in dumpsys output

Bug: 74090881
Test: Toggle Bluetooth, airplane mode, BLE scanning
Change-Id: I06aa413e2a0a5f016c87759a1b694ef643c9cdee