Make usage of blank lines more consistent in edkrepo

[kevinsun49]

https://peps.python.org/pep-0008/#blank-lines

Ensure all code in edkrepo fits the following criteria:

• Surround top-level function and class definitions with two blank lines.
• Method definitions inside a class are surrounded by a single blank line.

In short, all classes should have 2 blank lines surrounding them, all global level functions should have 2 blank lines surrounding them, and all methods inside of a class should have 1 blank line surrounding them.

Please submit one PR with one commit for each of the following categories:

• edkrepo/commands/*
• edkrepo/common/*
• All of these together:
  • edkrepo/config/*
  • edkrepo/git_automation/*
  • edkrepo/command_completion_edkrepo.py
  • edkrepo/edkrepo_cli.py
  • edkrepo/edkrepo_entry_point.py
• edkrepo_manifest_parser/edk_manifest.py