feat(shrex): metrics

[distractedm1nd]

Closes #2143
Adds metrics to ShrexGetter, and ShrexEDS/ShrexND Client and Server (including shrex middleware)

[codecov-commenter]

Codecov Report

Merging #2095 (1172b73) into main (5c0b128) will increase coverage by 0.52%.
The diff coverage is 73.54%.

@@            Coverage Diff             @@
##             main    #2095      +/-   ##
==========================================
+ Coverage   55.44%   55.96%   +0.52%     
==========================================
  Files         212      213       +1     
  Lines       13576    13846     +270     
==========================================
+ Hits         7527     7749     +222     
- Misses       5286     5325      +39     
- Partials      763      772       +9     

Impacted Files	Coverage Δ
cmd/celestia/rpc.go	11.44% <0.00%> (-0.35%)	⬇️
nodebuilder/share/opts.go	62.50% <57.14%> (-37.50%)	⬇️
share/p2p/shrexeds/client.go	64.00% <57.14%> (-0.52%)	⬇️
share/p2p/shrexeds/params.go	62.50% <57.14%> (-7.50%)	⬇️
share/p2p/shrexnd/params.go	62.50% <57.14%> (-37.50%)	⬇️
share/p2p/shrexnd/server.go	66.89% <68.75%> (-0.03%)	⬇️
share/getters/shrex.go	81.25% <70.00%> (-4.33%)	⬇️
share/p2p/metrics.go	70.96% <70.96%> (ø)
share/p2p/shrexnd/client.go	68.00% <71.42%> (-0.34%)	⬇️
share/p2p/shrexeds/server.go	65.57% <72.72%> (+0.39%)	⬆️
... and 8 more

... and 3 files with indirect coverage changes