support ad-hoc polygons in query

[shz117]

• support ad-hoc polygon in a new filter in_polygon(<point_column>, <polygon in WKT format>)
• allow exporting polygon as virtual dimension "_geoshape"

[codecov-io]

Codecov Report

Merging #275 into master will increase coverage by <.01%. The diff coverage is 77.41%.

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
+ Coverage    71.8%   71.81%   +<.01%     
==========================================
  Files         166      166              
  Lines       22868    22915      +47     
==========================================
+ Hits        16421    16457      +36     
- Misses       5167     5176       +9     
- Partials     1280     1282       +2

Impacted Files	Coverage Δ
query/aql_context.go	88.23% <ø> (ø)	:arrow_up:
query/aql_compiler.go	73.11% <68.96%> (-0.63%)	:arrow_down:
query/aql_processor.go	80.11% <91.42%> (+0.23%)	:arrow_up:
controller/mutators/etcd/schema_mutator.go	59.17% <0%> (-1.78%)	:arrow_down:
memstore/cuckoo_index.go	91.27% <0%> (+1%)	:arrow_up:
subscriber/common/job/driver.go	71.98% <0%> (+1.41%)	:arrow_up:
broker/query_plan_non_agg.go	86.56% <0%> (+2.23%)	:arrow_up:

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[shz117]

close for now, might need major refactor