track memory arena memory usage

[PSeitz]

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[codecov-commenter]

Codecov Report

Merging #2148 (f999b62) into main (62ece86) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main    #2148      +/-   ##
==========================================
+ Coverage   94.32%   94.34%   +0.01%     
==========================================
  Files         320      320              
  Lines       62041    62042       +1     
==========================================
+ Hits        58522    58531       +9     
+ Misses       3519     3511       -8     

Files Changed	Coverage Δ
src/collector/filter_collector_wrapper.rs	95.65% <ø> (ø)
src/aggregation/bucket/term_agg.rs	94.90% <100.00%> (+<0.01%)	⬆️
src/collector/tests.rs	97.68% <100.00%> (ø)
src/collector/top_score_collector.rs	98.04% <100.00%> (ø)
src/core/index.rs	87.43% <100.00%> (ø)
src/core/tests.rs	98.97% <100.00%> (ø)
src/query/range_query/range_query.rs	86.31% <100.00%> (ø)
src/snippet/mod.rs	95.44% <100.00%> (ø)
stacker/src/arena_hashmap.rs	97.50% <100.00%> (ø)

... and 1 file with indirect coverage changes