INFO KEYSIZES section feature

[hwware]

It is related to the issue #1827 (comment), #1880, and #1151

Reference Redis latest feature in Version 8 as below:

127.0.0.1:6379> INFO keysizes

Keysizes
db0_distrib_strings_sizes:1=19,2=655,4=3918,8=19,16=23,32=326,64=5,128=1,256=47,512=100899,1K=31,2K=29,4K=23,8K=16,16K=3,32K=2
db0_distrib_lists_items:1=5784492,2=151535,4=46670,8=20453,16=8637,32=3558,64=1047,128=676,256=533,512=218,4K=1,8K=42
db0_distrib_sets_items:1=7355615,2=207181,4=50612,8=21462,16=8864,32=2905,64=1365,128=974,256=773,512=675,1K=395,2K=292,4K=154,8K=89,16K=48,32K=21,64K=27,128K=16,256K=5,512K=4,1M=2
db0_distrib_hashes_items:2=1,4=544,8=746485,16=324174,32=141169,64=207329,128=4349,256=136226,1K=1

[codecov]

Codecov Report

Attention: Patch coverage is 98.14815% with 3 lines in your changes missing coverage. Please review.

Project coverage is 71.09%. Comparing base (204097d) to head (53fb2c0).

Files with missing lines	Patch %	Lines
src/t_hash.c	94.11%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1914      +/-   ##
============================================
+ Coverage     71.07%   71.09%   +0.01%     
============================================
  Files           123      123              
  Lines         65683    65806     +123     
============================================
+ Hits          46687    46787     +100     
- Misses        18996    19019      +23     

Files with missing lines	Coverage Δ
src/server.h	100.00% <ø> (ø)
src/t_list.c	93.15% <100.00%> (+0.30%)	⬆️
src/t_set.c	97.88% <100.00%> (+0.04%)	⬆️
src/t_string.c	96.74% <100.00%> (+0.03%)	⬆️
src/t_zset.c	96.87% <100.00%> (+0.12%)	⬆️
src/t_hash.c	95.15% <94.11%> (-1.09%)	⬇️

... and 10 files with indirect coverage changes

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