Make directed-graph workflows optional

[charlieparkes]

Allow user of lpipe to process_event with a callable/function and avoid all directed-graph workflow setup

[codecov]

Codecov Report

Merging #24 into master will decrease coverage by 0.09%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   93.29%   93.20%   -0.10%     
==========================================
  Files          18       18              
  Lines         716      721       +5     
==========================================
+ Hits          668      672       +4     
- Misses         48       49       +1     

Impacted Files	Coverage Δ
lpipe/testing.py	100.00% <ø> (ø)
lpipe/pipeline.py	87.24% <83.33%> (-0.16%)	⬇️

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