add min/max bin size metrics to hash calculation

[jeffwashington]

Problem

Binning shows up in several places already. It is useful to keep track of the current distribution of pubkeys.

Summary of Changes

Log min/max bin size after we calculate hash and lamports.
Fixes #

[jeffwashington]

61M mnb snapshot:

calculate_accounts_hash_without_index accounts_scan=2172165i eliminate_zeros=1013083i hash=227026i hash_time_pre_us=226921i sort=3869011i hash_total=61837228i storage_sort_us=938i unreduced_entries=62830071i collect_snapshots_us=63446i num_snapshot_storage=372887i min_bin_size=824i max_bin_size=1131i total=7345669i

[codecov]

Codecov Report

Merging #18155 (3ed422a) into master (d3ee73e) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##           master   #18155     +/-   ##
=========================================
- Coverage    82.3%    82.3%   -0.1%     
=========================================
  Files         433      433             
  Lines      120880   120886      +6     
=========================================
- Hits        99592    99555     -37     
- Misses      21288    21331     +43     

[jbiseda]

looks good