[Enhancement] extend edkrepo log command line argument

[chrisyly]

Brief: Introduce more kwargs option in "edkrepo log" command

Command "edkrepo log" is defined under:

• edk2-edkrepo/edkrepo/commands/log_command.py

It retrieve commit messages through gitpython module called under:

• edk2-edkrepo/edkrepo/commands/common_repo_functions.py -> sort_commits()

The API being used from gitpython is Repo.iter_commits()

• from implementation, sort_commits feeds either empty argument or max_count to iter_commits
• The API "iter_commits" doc "https://gitpython.readthedocs.io/en/stable/reference.html" indicate it can accept all argument from git-rev-list

Hence iter_commits could accept more argument such as:

• iter_commits("origin/master..HEAD")
• majority of the git log arguments

Feature request:

• Adding kwargs to iter_commits to extend "edkrepo log" command line option Result:
• "edkrepo log" can be more "git log" like command