enable individual labels from aggregate

[KalmanMeth]

Addresses #265
https://issues.redhat.com/browse/NETOBSERV-490

[jotak]

LGTM
Maybe we can think about a follow-up, because it creates redundant information in metrics (there are individual labels AND concatenated labels) => maybe a bool flag, or an enum in Aggregation api to let the user choose how they want the result to look like? E.g. labelsMode: enum(copy|concat)

[ronensc]

I would add a few more checks to test the new behavior.
Something like:

	err, normalizedLabels, labels := aggregate.FilterEntry(entry)
	require.Equal(t, err, nil)
	require.Equal(t, Labels{"srcIP": "10.0.0.1", "dstIP": "20.0.0.2"}, labels)
	require.Equal(t, NormalizedValues("20.0.0.2,10.0.0.1"), normalizedLabels)

[codecov-commenter]

Codecov Report

Merging #269 (2b75e4c) into main (94fcbbf) will increase coverage by 6.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #269      +/-   ##
==========================================
+ Coverage   60.70%   66.88%   +6.18%     
==========================================
  Files          73       73              
  Lines        4247     4149      -98     
==========================================
+ Hits         2578     2775     +197     
+ Misses       1502     1194     -308     
- Partials      167      180      +13     

Flag	Coverage Δ
unittests	66.88% <100.00%> (+6.18%)	⬆️

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

Impacted Files	Coverage Δ
pkg/pipeline/extract/aggregate/aggregate.go	96.90% <100.00%> (+0.08%)	⬆️
pkg/config/pipeline_builder.go	87.27% <0.00%> (-8.19%)	⬇️
pkg/confgen/config.go	33.33% <0.00%> (ø)
cmd/confgenerator/main.go	0.00% <0.00%> (ø)
cmd/flowlogs-pipeline/main.go	0.00% <0.00%> (ø)
pkg/pipeline/utils/params_parse.go
pkg/config/stage_params.go	100.00% <0.00%> (ø)
pkg/pipeline/ingest/ingest_collector.go	49.62% <0.00%> (+1.50%)	⬆️
pkg/test/utils.go	64.70% <0.00%> (+1.74%)	⬆️
pkg/pipeline/write/write_loki.go	67.77% <0.00%> (+2.94%)	⬆️
... and 7 more

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