AIPO-756: Add in better debug logging

[alexlatchford]

In the course of investigating AIPO-756 needed to make the debug logging work and decided to extend it.

[codecov-commenter]

Codecov Report

Merging #16 into master will increase coverage by 0.21%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   96.27%   96.49%   +0.21%     
==========================================
  Files           6        6              
  Lines         215      228      +13     
==========================================
+ Hits          207      220      +13     
  Misses          8        8              

Impacted Files	Coverage Δ
battenberg/core.py	96.90% <90.90%> (+0.20%)	⬆️
battenberg/cli.py	91.30% <100.00%> (+0.19%)	⬆️
battenberg/temporary_worktree.py	97.67% <100.00%> (+0.37%)	⬆️

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