Provide methods to initialize and deinitialize battery monitor

Provide methods to initialize and deinitialize battery monitor
feature

Provide callback during initialization so that the following
bluetooth data for the session is provided to battery monitor frwk
when bluetooth adapter is disabled:
	session_start_time
	session_end_time
	session_scan_time
	session_connected_time
	app-wise data transaction details for the session

Change-Id: If48adf6944a50d67e91d3b18c54b163b5adc745b
Signed-off-by: Sudipto <sudipto.bal@samsung.com>