[Access] Add metrics to execution state indexer

[peterargue]

Adds metrics to execution data indexer.

[codecov-commenter]

Codecov Report

Attention: 116 lines in your changes are missing coverage. Please review.

Comparison is base (9c6f9ff) 55.80% compared to head (9afb31f) 55.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4801      +/-   ##
==========================================
- Coverage   55.80%   55.78%   -0.02%     
==========================================
  Files         939      940       +1     
  Lines       86922    86993      +71     
==========================================
+ Hits        48508    48532      +24     
- Misses      34764    34808      +44     
- Partials     3650     3653       +3     

Flag	Coverage Δ
unittests	55.78% <9.37%> (-0.02%)	⬇️

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

Files	Coverage Δ
...dule/state_synchronization/indexer/indexer_core.go	87.41% <100.00%> (+0.84%)	⬆️
module/metrics/noop.go	0.00% <0.00%> (ø)
module/metrics/execution_state_indexer.go	0.00% <0.00%> (ø)

... and 6 files with indirect coverage changes

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