#1390 - configurable backend for group by buckets

[MrHDOLEK]

Makes GroupBy aggregation memory-efficient and configurable (issue #1390): keep the fast in-memory path by default, or opt into an external, bounded-memory path.

Resolves: #1390
Resolves: #2472 because this pr resolve this problem.

Change Log

---

Added

• Configurable, memory-efficient GroupBy aggregation: ConfigBuilder::aggregationAlgorithm() and the AggregationAlgorithms enum select between MEMORY_AGGREGATION (default, in-memory hash map) and EXTERNAL_AGGREGATION (sorts by the group-by columns and folds, spilling to disk for bounded memory), with aggregationFilesystem() for the spill protocol.
• GroupBy streams its result in batches instead of materializing every group into a single Rows.

Fixed

Changed

Removed

Deprecated

Security

[codecov]

Codecov Report

❌ Patch coverage is 89.62656% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.36%. Comparing base (7080d25) to head (fe3abaa).
⚠️ Report is 1 commits behind head on 1.x.

Additional details and impacted files

@@            Coverage Diff             @@
##                1.x    #2473    +/-   ##
==========================================
  Coverage     86.36%   86.36%            
- Complexity    22901    22958    +57     
==========================================
  Files          1740     1748     +8     
  Lines         70386    70535   +149     
==========================================
+ Hits          60789    60918   +129     
- Misses         9597     9617    +20     

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