Switch from flow to flow_id and from groups to group_ids for ES queries

[rowanseymour]

Requires nyaruka/rp-indexer#39

[codecov]

Codecov Report

Merging #1089 (dde8230) into main (7fe09d1) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1089      +/-   ##
==========================================
+ Coverage   87.60%   87.65%   +0.05%     
==========================================
  Files         256      257       +1     
  Lines       10742    10745       +3     
==========================================
+ Hits         9410     9419       +9     
+ Misses        916      913       -3     
+ Partials      416      413       -3     

Impacted Files	Coverage Δ
contactql/es/query.go	87.41% <100.00%> (ø)
contactql/mock.go	100.00% <100.00%> (ø)
flows/engine/errors.go	100.00% <0.00%> (ø)
flows/engine/session.go	74.91% <0.00%> (+2.15%)	⬆️

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