feat: agnostic config saving

[KyleTryon]

fixes: #153

This change should allow for saving the config directly to a file without the user needing to configure external dependencies. This should work for both NodeJs and the browser.

Test coverage has fallen due to the new branch of file saving for browser which was not automatically tested here, looking into if we can do that with jest or is cypress needed

Note: saving with the browser requires user interaction
https://developer.mozilla.org/en-US/docs/Web/API/Window/showSaveFilePicker#security

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Legend

[codecov]

Codecov Report

Base: 97.29% // Head: 96.15% // Decreases project coverage by -1.13% ⚠️

Coverage data is based on head (312252a) compared to base (871b65b).
Patch coverage: 27.27% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
- Coverage   97.29%   96.15%   -1.14%     
==========================================
  Files          61       61              
  Lines         665      676      +11     
  Branches       66       69       +3     
==========================================
+ Hits          647      650       +3     
- Misses          6       11       +5     
- Partials       12       15       +3     

Impacted Files	Coverage Δ
src/lib/Config/index.ts	86.76% <27.27%> (-11.49%)	⬇️

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[Jaryt]

Very nice!