chore(build): add TS support

[wise-king-sullyman]

Closes #561

This does:

• Add basic build infrastructure to support TS usage in the repo
• Update the entire class-name-updater package to TS
• Update the operating logic of eslint-plugin-pf-codemods to TS

This does not:

• Update the pf-codemods package to TS, because I plan to make a new package for v6 forward to prevent breaking the pf-codemods package for v5 updates
• Update the rules or tests in eslint-plugin-pf-codemods to TS, because we don't plan to do development on the existing rules. New rules created for, or rules copied to, v6 forward should be TS from the start.

[gitdallas]

👍