chore: batch event schema messages for faster processing

[atzoum]

Description

Related to this, rudder-server will now batch statistics for multiple rudder events in the same message so that schema workers can increase their event processing throughput even more.

Notion Ticket

Link

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 77.94% and project coverage change: +0.34 🎉

Comparison is base (4a94c15) 68.12% compared to head (5f8469e) 68.47%.

❗ Current head 5f8469e differs from pull request most recent head c7158d6. Consider uploading reports for the commit c7158d6 to get more accurate results

Additional details and impacted files

@@                Coverage Diff                @@
##           release/1.9.x    #3406      +/-   ##
=================================================
+ Coverage          68.12%   68.47%   +0.34%     
=================================================
  Files                329      330       +1     
  Lines              53492    52780     -712     
=================================================
- Hits               36443    36141     -302     
+ Misses             14719    14309     -410     
  Partials            2330     2330              

Impacted Files	Coverage Δ
warehouse/admin.go	3.17% <0.00%> (ø)
warehouse/errors.go	89.47% <ø> (+3.75%)	⬆️
...ns/datalake/schema-repository/schema_repository.go	85.00% <ø> (ø)
warehouse/integrations/manager/manager.go	95.83% <ø> (ø)
warehouse/jobs/jobs.go	7.69% <0.00%> (ø)
warehouse/utils/utils.go	82.27% <ø> (ø)
warehouse/client/client.go	48.31% <33.33%> (ø)
warehouse/identities.go	19.40% <43.75%> (+2.55%)	⬆️
warehouse/integrations/datalake/datalake.go	60.00% <47.61%> (ø)
warehouse/warehouse.go	63.58% <55.17%> (+7.57%)	⬆️
... and 32 more

... and 10 files with indirect coverage changes

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