Rename all kube.Store and store.InMemory fields for consistency

[pinoOgni]

Right now we have different names for variables of the following type:

• kube.Store: db, k8sStore, metaStore, metadata, meta or store
• store.InMemory: ipToHosts or dnsDB

This PR renames all kube.Store fields to store and all store.InMemory to dnsCache (maybe cache?) to have consistent naming in the entire project. It also updates the pipeline-map doc.

[codecov]

Codecov Report

❌ Patch coverage is 49.05660% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.41%. Comparing base (03f80bc) to head (1e8b6ce).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/transform/k8s.go	60.00%	6 Missing ⚠️
pkg/transform/name_resolver.go	66.66%	3 Missing and 2 partials ⚠️
pkg/appolly/discover/container_updater.go	0.00%	4 Missing ⚠️
pkg/internal/netolly/transform/k8s/kubernetes.go	0.00%	4 Missing ⚠️
pkg/kube/informer_provider.go	0.00%	4 Missing ⚠️
pkg/internal/netolly/flow/reverse_dns.go	0.00%	3 Missing ⚠️
pkg/appolly/discover/finder.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1297      +/-   ##
==========================================
- Coverage   43.41%   43.41%   -0.01%     
==========================================
  Files         304      304              
  Lines       32779    32779              
==========================================
- Hits        14232    14230       -2     
- Misses      17630    17631       +1     
- Partials      917      918       +1     

Flag	Coverage Δ
integration-test	21.05% <19.23%> (-0.06%)	⬇️
integration-test-arm	0.00% <0.00%> (ø)
k8s-integration-test	2.36% <0.00%> (-0.01%)	⬇️
oats-test	0.00% <0.00%> (ø)
unittests	44.28% <46.15%> (ø)

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[grcevski]

Amazing! LGTM!