Give Diffractor an AbstractDifferentiation interface

[oscardssmith]

This actually passes tests.

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: +1.73% 🎉

Comparison is base (8af6de2) 53.25% compared to head (a1e8810) 54.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
+ Coverage   53.25%   54.98%   +1.73%     
==========================================
  Files          27       28       +1     
  Lines        2783     2790       +7     
==========================================
+ Hits         1482     1534      +52     
+ Misses       1301     1256      -45     

Files Changed	Coverage Δ
src/interface.jl	67.39% <66.66%> (-1.36%)	⬇️
src/AbstractDifferentiation.jl	87.50% <87.50%> (ø)
src/Diffractor.jl	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[oxinabox]

Do we have tests of these?

[staticfloat]

Yes, tests please.

[oxinabox]

Oops we forgot to merge this 😂
time for 0.2.1

[oxinabox]

please merge and tag as soon as CI passes

[oxinabox]

CI break on nightly is unrelated