tools: write block generator ledger output to a file

[winder]

Summary

Pass a logger to the ledger when opening it.

Testing

Tested manually.

[codecov]

Codecov Report

Merging #5630 (0191f75) into master (ba17c2c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5630   +/-   ##
=======================================
  Coverage   54.97%   54.97%           
=======================================
  Files         463      463           
  Lines       64468    64468           
=======================================
+ Hits        35439    35441    +2     
+ Misses      26650    26649    -1     
+ Partials     2379     2378    -1     

Files Changed	Coverage Δ
ledger/lrukv.go	95.55% <100.00%> (ø)
ledger/lruresources.go	94.20% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[winder]

There are tests for these warn messages. Moving this back to a draft until I can fix them.

[tzaffi]

Approving with a non-blocking question.

... well I forgot that questions do block now, until they are addressed/dismissed. Resolved the discussion as well.