This patch enables yaml2elf emit the .debug_line section.
Test cases for emitting the dwarf64 .debug_line section and opcodes will be added later.
- We should replace InitialLength with Format and Length
- Currently implementation of the .debug_line section only fully supports DWARFv2, some header fields in DWARFv4 and DWARFv5 is missing, e.g., header_length in DWARFv4, address_size and segment_selector_size in DWARFv5.
- Some opcodes relies on the .debug_info section, we should warn user about it.
These issues will be addressed in a follow-up patch.