refactor patching logic

[pmeier]

This is a very early prototype of a refactoring I have in mind. Posting this here for CI :innocent:

[codecov[bot]]

Codecov Report

Merging #104 (6c544a6) into main (8e37c9b) will decrease coverage by 1.0%. The diff coverage is 58.0%.

:exclamation: Current head 6c544a6 differs from pull request most recent head c01c79a. Consider uploading reports for the commit c01c79a to get more accurate results

@@           Coverage Diff           @@
##            main    #104     +/-   ##
=======================================
- Coverage   83.6%   82.6%   -1.0%     
=======================================
  Files          5       6      +1     
  Lines        354     392     +38     
=======================================
+ Hits         296     324     +28     
- Misses        58      68     +10     

Flag	Coverage Δ
unit	82.6% <58.0%> (-1.0%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
light_the_torch/_patch.py	80.6% <33.3%> (+5.1%)	:arrow_up:
light_the_torch/_packages.py	65.2% <65.2%> (ø)

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[pmeier]

In the aftermath of #115, we need this even more.

[pmeier]

The general functionality is there, but we still need to merge with main. Will send more PRs against this one to minimize the risk botching this.

[pmeier]

The following PRs need to be ported:

• [ ] #114
• [ ] #115
• [x] #116 -> 3058d645a001c23ab5765e97242c3b0ada62bd5c
• [x] #117 -> 7df4d050f2bb129614eee75044a85887754859da, c01c79a796a2c4bc370a90c72274bb4512678f3a