MdeModulePkg:Create Boot Maintenance Manager Library

Split the boot maintenance manager library from UiApp in MdeModulePkg/Application
and put the library in MdeModulePkg/Library.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18923 6f19259b-4bc3-4df7-8a09-765794883524