ci: add path ignore files for ci

[abyssnlp]

Description

• Only run tests when a change is made on any of the relevant paths.
• Move license and style checks to another CI workflow

Closes #84

How are the changes test-covered

• [ ] N/A
• [x] Automated tests (unit and/or integration tests)
• [ ] Manual tests
  • [ ] Details are described below

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.24%. Comparing base (a699b44) to head (6323099). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #93 +/- ## ======================================= Coverage 87.24% 87.24% ======================================= Files 14 14 Lines 690 690 ======================================= Hits 602 602 Misses 88 88 ```

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