Add a Time To Seal metric to access node to track time it takes to seal a transaction

[AndriiDiachuk]

Closes: #6448.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 63 lines in your changes missing coverage. Please review.

Project coverage is 41.11%. Comparing base (21cfe5a) to head (41b0fad).

Files with missing lines	Patch %	Lines
module/metrics/transaction.go	0.00%	36 Missing ⚠️
...chronization/indexer/collection_executed_metric.go	0.00%	10 Missing ⚠️
cmd/access/node_builder/access_node_builder.go	0.00%	6 Missing ⚠️
cmd/observer/node_builder/observer_builder.go	0.00%	6 Missing ⚠️
module/mock/access_metrics.go	0.00%	2 Missing ⚠️
module/mock/transaction_metrics.go	0.00%	2 Missing ⚠️
module/metrics/noop.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6512      +/-   ##
==========================================
- Coverage   41.28%   41.11%   -0.18%     
==========================================
  Files        2030     1912     -118     
  Lines      145865   135951    -9914     
==========================================
- Hits        60221    55894    -4327     
+ Misses      79419    74385    -5034     
+ Partials     6225     5672     -553     

Flag	Coverage Δ
unittests	41.11% <0.00%> (-0.18%)	⬇️

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