rdp: Improved rdp logging infrastructure

Add some logging helper functions along with two log scopes for debug
and extremely verbose debugging information.

Also add tangentially related logging for the synchronize event, so
the debug stream isn't empty right now. The vast majority of verbose
usage will come later.

Co-authored-by: Steve Pronovost <spronovo@microsoft.com>
Co-authored-by: Brenton DeGeer <brdegeer@microsoft.com>
Signed-off-by: Hideyuki Nagase <hideyukn@microsoft.com>
Signed-off-by: Steve Pronovost <spronovo@microsoft.com>
Signed-off-by: Brenton DeGeer <brdegeer@microsoft.com>