[DWARFLinkerParallel] add AddressesMap interface.

This patch is extracted from D96035. It adds AddressesMap map interface
to the DWARFLinkerParallel library. This interface mostly match with the
paired interface from the DWARFLinker library, except that it does
not depend on DIEInfo class.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D140788