support displaying ast types

[samuelcolvin]

Support pretty display of ast types.

[codecov]

Codecov Report

Merging #125 (b7edd9a) into main (3d5ff65) will decrease coverage by 0.36%.
The diff coverage is 80.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
- Coverage   99.25%   98.90%   -0.36%     
==========================================
  Files           7        7              
  Lines         537      547      +10     
  Branches       75       76       +1     
==========================================
+ Hits          533      541       +8     
- Misses          2        4       +2     
  Partials        2        2              

Impacted Files	Coverage Δ
devtools/prettier.py	98.00% <80.00%> (-0.95%)	⬇️

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