Complete (I think) AST parsing for mango queries

[flimzy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.11521% with 54 lines in your changes missing coverage. Please review.

Project coverage is 63.24%. Comparing base (b1a9ff9) to head (d7db50a).

Files	Patch %	Lines
x/mango2/ast/selector.go	37.33%	46 Missing and 1 partial ⚠️
x/mango2/ast/ast.go	95.07%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1008      +/-   ##
==========================================
+ Coverage   63.10%   63.24%   +0.13%     
==========================================
  Files         285      287       +2     
  Lines       18663    18880     +217     
==========================================
+ Hits        11777    11940     +163     
- Misses       6354     6404      +50     
- Partials      532      536       +4     

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