Feature/tests

[boldandbrad]

• add basic unit tests
• add semgrep linter
• update pre-commit handling in testing github action
• add pre-commit caching to testing github action
• add basic codecov config
• add codecov test coverage publishing to testing github action
• update publish github action
• bump beta version
• update justfile

closes #33

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (develop@8a895ff). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head 9ad7873 differs from pull request most recent head 2c4d52d. Consider uploading reports for the commit 2c4d52d to get more accurate results

@@            Coverage Diff             @@
##             develop      #47   +/-   ##
==========================================
  Coverage           ?   51.17%           
==========================================
  Files              ?       31           
  Lines              ?      848           
  Branches           ?        0           
==========================================
  Hits               ?      434           
  Misses             ?      414           
  Partials           ?        0           

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