Rework glib main loop initializationHEADmaster

Changes:
- To avoid interactions with Qt6's new and/or different use of the
  glib main loop, explicitly create new main context and loop
  instances for our processing thread to avoid any interactions.
  This includes making the new context the default for the thread,
  which impacts implicit usage in glib functions.
- Refactor things a bit to have agent registration run completely
  asynchronously to avoid that operation blocking Qt initialization.
- To expand on the above, add new checking of the agent state to
  the connect & disconnect calls that rely on the agent, and add a
  new connman_get_agent_registered API function that clients can
  use to check the state.
- Added some more DEBUG prints for potential future use, and bumped
  the default log level to WARNING to make it easier to diagnose
  any agent registration failures.

Bug-AGL: SPEC-5257

Change-Id: I290f81c99b4ffc2939ef6f503505deabbd1ebc0b
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

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