Add matching support to mango2 pkg

[flimzy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.69957% with 24 lines in your changes missing coverage. Please review.

Project coverage is 63.60%. Comparing base (83551d1) to head (339648e).

Files	Patch %	Lines
x/mango2/ast/selector.go	88.00%	18 Missing ⚠️
x/collate/collate.go	90.56%	3 Missing and 2 partials ⚠️
x/collate/json.go	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1011      +/-   ##
==========================================
+ Coverage   63.24%   63.60%   +0.36%     
==========================================
  Files         287      289       +2     
  Lines       18880    19090     +210     
==========================================
+ Hits        11940    12143     +203     
- Misses       6404     6409       +5     
- Partials      536      538       +2     

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