[lldb] Add AddressSpaceInfo and ProcessAddress utility classes (#206370)
This is part of larger effort to support address spaces in lldb
https://discourse.llvm.org/t/rfc-address-spaces-support-in-lldb/91222/
This PR introduces the definition of AddressSpace and ProcessAddress
classes, which are foundational for next PRs
Stack:
1. #206370 (this PR) - the classes
2. #214088 ProcessAddress adoption (NFC)
3. #214089 Generic address space support