Migrating from TSLint to ESLint

[Sarvesh67]

1. Migrated to best fit rules from TSLint to ESLint.
2. Removed TSLint.

Pull request checklist

Please check if your PR :rocket: fulfills the following requirements:

• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been reviewed and added / updated if needed (for bug fixes / features)
• [x] Build (npm run start) was run locally and new changes were working correctly
• [x] Lint (npm run linter) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces: - [ ] Bugfix - [ ] Feature - [ ] Code style update (formatting, renaming) - [x] Refactoring (no functional changes, no api changes) - [ ] Build related changes - [ ] Documentation content changes - [ ] Other (please describe): ## What is the current behavior? Linting is done using TSLint, which has been deprecated.

Fixes #66

What is the new behavior?

• Linting is now done using ESLint.
• File changes have been made (cosmetic changes).

Does this introduce a breaking change?

• [ ] Yes
• [x] No