Calculate db bucket size

[IronGauntlets]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 49.55752% with 57 lines in your changes missing coverage. Please review.

Project coverage is 75.15%. Comparing base (464e623) to head (ec99e05).

Files	Patch %	Lines
cmd/juno/dbsize.go	15.21%	38 Missing and 1 partial :warning:
cmd/juno/genp2pkeypair.go	61.53%	5 Missing and 5 partials :warning:
db/pebble/db.go	83.33%	3 Missing and 2 partials :warning:
cmd/juno/juno.go	40.00%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1773      +/-   ##
==========================================
- Coverage   75.48%   75.15%   -0.33%     
==========================================
  Files          97       99       +2     
  Lines        8676     8752      +76     
==========================================
+ Hits         6549     6578      +29     
- Misses       1545     1588      +43     
- Partials      582      586       +4     

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