core/tracker2: add tracker2 package

[dB2510]

Adds refactored tracker logic as tracker2 package in core/tracker package.

category: refactor
ticket: #1478

[codecov]

Codecov Report

Base: 54.51% // Head: 54.53% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (392d330) compared to base (095a998).
Patch coverage: 4.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1666      +/-   ##
==========================================
+ Coverage   54.51%   54.53%   +0.02%     
==========================================
  Files         157      158       +1     
  Lines       20024    20178     +154     
==========================================
+ Hits        10917    11005      +88     
- Misses       7656     7720      +64     
- Partials     1451     1453       +2     

Impacted Files	Coverage Δ
core/consensus/component.go	61.51% <0.00%> (-0.40%)	⬇️
core/interfaces.go	0.00% <ø> (ø)
core/tracking.go	0.00% <0.00%> (ø)
core/sigagg/sigagg.go	54.54% <100.00%> (+2.16%)	⬆️
dkg/transport.go	53.70% <0.00%> (-12.97%)	⬇️
app/app.go	64.06% <0.00%> (-1.09%)	⬇️
p2p/bootnode.go	0.00% <0.00%> (ø)
cmd/createcluster.go	53.15% <0.00%> (+<0.01%)	⬆️
core/priority/prioritiser.go	61.69% <0.00%> (+1.20%)	⬆️
app/vmock.go	74.61% <0.00%> (+1.55%)	⬆️
... and 4 more

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[corverroos]

can create duplicate metrics, suggest only moving metrics here once they are "enabled" in v2.

[dB2510]

Added tracker2 in metrics naming to avoid duplication, v2 will be behind a featureflag until we are confident. These metrics were needed since I copy pasted most of the code and metrics was also part of it.
Will address this in my next PR to wire and add tests.