Lookout v2 API - state counts as group aggregate

[carlocamurri]

Enables providing state as an aggregate to the jobGroups endpoint, which will return a mapping from state -> count of jobs in that state for each group returned.

Key changes:

• Have abstracted code that generates SQL aggregate expression in aggregates.go
• Aggregated fields can now result in multiple aggregates (for states, we will get a different aggregated column for each required state)
• Parsing group SQL is abstracted in fieldparser.go, instead of relying on higher order functions

[codecov]

Codecov Report

Patch coverage: 79.74% and project coverage change: +1.47 🎉

Comparison is base (d59732a) 58.65% compared to head (830942a) 60.12%.

❗ Current head 830942a differs from pull request most recent head 072c85b. Consider uploading reports for the commit 072c85b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2605      +/-   ##
==========================================
+ Coverage   58.65%   60.12%   +1.47%     
==========================================
  Files         236      240       +4     
  Lines       30458    31914    +1456     
==========================================
+ Hits        17865    19189    +1324     
- Misses      11221    11327     +106     
- Partials     1372     1398      +26     

Flag	Coverage Δ
armada-server	60.12% <79.74%> (+1.47%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/lookoutv2/repository/querybuilder.go	64.13% <62.50%> (ø)
internal/lookoutv2/repository/aggregates.go	74.39% <74.39%> (ø)
internal/lookoutv2/repository/groupjobs.go	69.15% <79.48%> (-1.26%)	⬇️
internal/lookoutv2/repository/fieldparser.go	81.81% <81.81%> (ø)
internal/lookoutv2/repository/util.go	71.35% <93.18%> (+4.74%)	⬆️
internal/lookoutv2/repository/tables.go	89.38% <100.00%> (+0.09%)	⬆️

... and 28 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.