fraud: add metrics

[vgonkivs]

[codecov-commenter]

Codecov Report

Merging #1012 (a851188) into main (2cc8077) will increase coverage by 0.54%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #1012      +/-   ##
==========================================
+ Coverage   58.53%   59.08%   +0.54%     
==========================================
  Files         132      133       +1     
  Lines        7947     8070     +123     
==========================================
+ Hits         4652     4768     +116     
- Misses       2818     2829      +11     
+ Partials      477      473       -4     

Impacted Files	Coverage Δ
fraud/service.go	68.80% <66.66%> (-0.76%)	:arrow_down:
cmd/celestia/full.go	40.98% <0.00%> (-1.39%)	:arrow_down:
cmd/celestia/light.go	40.98% <0.00%> (-1.39%)	:arrow_down:
service/state/core_access.go	17.26% <0.00%> (-1.06%)	:arrow_down:
ipld/get_shares.go	90.90% <0.00%> (-0.93%)	:arrow_down:
cmd/env.go	76.47% <0.00%> (ø)
ipld/helpers.go	100.00% <0.00%> (ø)
cmd/flags_p2p.go	59.25% <0.00%> (ø)
cmd/flags_rpc.go	76.00% <0.00%> (ø)
cmd/flags_core.go	42.37% <0.00%> (ø)
... and 13 more

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[vgonkivs]

Closed in favour of https://github.com/celestiaorg/celestia-node/pull/1047