add debug logs for leader fees

[AdoAdoAdo]

Reasoning behind the pull request

• analysis of leader fees and rewards dust

Proposed changes

• add some debug logs for the leader accumulated fees

Testing procedure

• run a system test with transactions for metachain and analyse the logs

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov-commenter]

Codecov Report

Base: 70.80% // Head: 70.79% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (2f32d8b) compared to base (aa657cb).
Patch coverage: 65.21% of modified lines in pull request are covered.

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Additional details and impacted files

@@              Coverage Diff              @@
##           rc/v1.4.0    #4932      +/-   ##
=============================================
- Coverage      70.80%   70.79%   -0.01%     
=============================================
  Files            648      648              
  Lines          85262    85284      +22     
=============================================
+ Hits           60366    60375       +9     
- Misses         20366    20378      +12     
- Partials        4530     4531       +1     

Impacted Files	Coverage Δ
process/block/metablock.go	61.98% <50.00%> (-0.09%)	⬇️
process/peer/process.go	72.80% <100.00%> (+0.27%)	⬆️
consensus/broadcast/delayedBroadcast.go	84.81% <0.00%> (-1.41%)	⬇️

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