Initial support for plugins via Pluggy

[darrenburns]

No description provided.

[codecov-commenter]

Codecov Report

Merging #210 (46a15a2) into master (d70c0ce) will increase coverage by 1.86%.
The diff coverage is 92.32%.

@@            Coverage Diff             @@
##           master     #210      +/-   ##
==========================================
+ Coverage   75.25%   77.11%   +1.86%     
==========================================
  Files          17       21       +4     
  Lines        1580     1691     +111     
  Branches      266      271       +5     
==========================================
+ Hits         1189     1304     +115     
+ Misses        349      344       -5     
- Partials       42       43       +1     

Impacted Files	Coverage Δ
ward/_diff.py	12.79% <0.00%> (ø)
ward/_errors.py	100.00% <ø> (ø)
ward/_rewrite.py	98.63% <ø> (ø)
ward/_utilities.py	83.33% <ø> (ø)
ward/_terminal.py	52.17% <81.81%> (ø)
ward/hooks.py	84.61% <84.61%> (ø)
ward/_run.py	86.60% <86.66%> (ø)
ward/_config.py	89.65% <89.65%> (ø)
ward/_collect.py	78.33% <93.54%> (ø)
ward/testing.py	93.29% <94.87%> (-0.18%)	⬇️
... and 16 more

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