Common cache with expiry time

[KalmanMeth]

Refactor multiple instances of LRU cache into shared code.

[codecov-commenter]

Codecov Report

Merging #204 (9d7f153) into main (3f5317c) will increase coverage by 0.13%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main     #204      +/-   ##
==========================================
+ Coverage   57.95%   58.09%   +0.13%     
==========================================
  Files          58       60       +2     
  Lines        3361     3374      +13     
==========================================
+ Hits         1948     1960      +12     
- Misses       1282     1283       +1     
  Partials      131      131              

Flag	Coverage Δ
unittests	58.09% <93.33%> (+0.13%)	⬆️

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

Impacted Files	Coverage Δ
pkg/pipeline/encode/encode_prom.go	75.56% <68.42%> (-6.21%)	⬇️
...ansform/connection_tracking/connection_tracking.go	94.28% <80.00%> (-3.22%)	⬇️
pkg/pipeline/extract/aggregate/aggregate.go	95.71% <100.00%> (+1.75%)	⬆️
pkg/pipeline/extract/aggregate/aggregates.go	90.38% <100.00%> (-0.19%)	⬇️
pkg/pipeline/utils/timed_cache.go	100.00% <100.00%> (ø)
pkg/pipeline/conntrack/hash.go	81.25% <0.00%> (ø)
pkg/pipeline/utils/exit.go	100.00% <0.00%> (+41.17%)	⬆️

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