refactor(): added enum with commands, linted everything, added jest and github actions for CI/CD

[Stradivario]

Description

Created better environment for testing, eslint installed, CI/CD using github actions added, refactored some part of the code with enums.

Type of change

• [x] Non Breaking change

Checklist:

• [x] Added jest for testing purposes
• [x] Added tests for revertJson and writeFile
• [x] Created enums for better managing of strings inside the project
• [x] Added pull request template