[Access] Add registerDB pruning module

[UlyanaAndrukhiv]

Closes #6068

In this PR:

• Implemented pruner module for registerDB which will ensure that unneeded pruned data is removed from the db, freeing up disk space.
• Integrated pruner into Access and Observer nodes.
• Added metrics.
• Added functional tests .

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 34.68750% with 209 lines in your changes missing coverage. Please review.

Project coverage is 41.42%. Comparing base (2a443de) to head (fc4d6cb).

Files with missing lines	Patch %	Lines
cmd/access/node_builder/access_node_builder.go	0.00%	51 Missing ⚠️
cmd/observer/node_builder/observer_builder.go	0.00%	50 Missing ⚠️
module/metrics/registers_db_pruner.go	0.00%	50 Missing ⚠️
storage/pebble/registers_pruner.go	79.16%	16 Missing and 9 partials ⚠️
module/mock/register_db_pruner_metrics.go	0.00%	13 Missing ⚠️
module/mock/access_metrics.go	0.00%	8 Missing ⚠️
storage/pebble/operation/registers.go	0.00%	6 Missing ⚠️
module/metrics/access.go	0.00%	3 Missing ⚠️
module/metrics/noop.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6397      +/-   ##
==========================================
- Coverage   41.44%   41.42%   -0.02%     
==========================================
  Files        2026     2030       +4     
  Lines      144629   144906     +277     
==========================================
+ Hits        59937    60024      +87     
- Misses      78492    78666     +174     
- Partials     6200     6216      +16     

Flag	Coverage Δ
unittests	41.42% <34.68%> (-0.02%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[UlyanaAndrukhiv]

WithPruneThreshold is temporarily commented out and will be re-enabled once PR #6345 is merged.

[peterargue]

nice work! I haven't finished reviewing everything, but here are my comments so far.