Python 3.10-3.13 line number and opcode argrepr fixes

[2elli]

Fixes

• Python 3.10 Code310.co_lines() was not parsing co_linetable correctly. Changed to using struct to iterate over the unsigned and signed bytes in the co_linetable, also re-implemented some of the byte parsing logic following cpython source.
• Python 3.11-3.13 opcode_310.py had incorrect ordering of assigning opcode_arg_fmt, leading to opcodes not being formatted correctly
  • This fixed many other things as well, like FORMAT_VALUE not having a correct argrepr.

Other Changes

• Removed xdis/codetype/code312.py as it was no longer needed. The code that was in there we found also applied to 3.11 so it was previously moved there.

To-do

Locally wrote some good cross-version tests; plan on using some of those ideas / code when I have the chance to work on improving xdis tests.

[rocky]

Thanks for all of the good work.