chore: add reserved keywords linter

[arbabkhalil]

TL;DR - [ A short summary of what this PR does and why ]

JIRA: JIRA-XXXX

What changed?

• [ More in depth breakdown of changes ]
• [ Peripheral things that got changed ]
• [ etc... ]

Developer Checklist

• [ ] Reviewed the release process
• [ ] Translations and JS/SASS compiled
• [ ] Bumped version number in setup.py and package.json

Testing Instructions

[ How should a reviewer test this PR? ]

Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• [ ] I've done a visual code review
• [ ] I've tested the new functionality

FYI: @edx/masters-devs-gta