Add git alias `gshn` (`git show --name-only`)

[bittner]

Adds a short Git alias for git show --name-only, which list the files affected by the changes only (instead of the full diff).

Description

The Git command git show --name-only list only the files affected by the changes instead of showing the full diff, which comes in handy when you need to know which files were affected w/o being distracted by the full diff of the changes.

The additional git show --name-status shows the current version control status of the listed files. (Maybe interesting to note, this is like a light version of git whatchanged -1.)

Motivation and Context

Just two convenient aliases in addition to gsh (git show) to avoid the need for typing and remembering the lengthy --name-only and --name-status options.

How Has This Been Tested?

I tried it out locally, applied the identical change to my local Bash-it setup.

Verified that there are no alias conflicts by grepping for "gsh" over the repository HEAD.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] If my change requires a change to the documentation, I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] If I have added a new file, I also added it to clean_files.txt and formatted it using lint_clean_files.sh.
• [ ] I have added tests to cover my changes, and all the new and existing tests pass.

[bittner]

The failing of the CI / lint job is likely unrelated to the changes introduced in this PR. – Go error: undefined: any

[bittner]

Two small, non-conflicting enhancements for Git.

Merging anyone?

[bittner]

Please, merge! Those are useful Git aliases that help to remember command options you would rarely use when you had to type them in full length.

[bittner]

Any comment on the proposed enhancement? Can this be merged?

[bittner]

Hey there, this is an easy one! No conflicts, no difficult decisions. Please review and merge! Now. :100: :guitar: :man_dancing: :smiley: