[Util] Add query last executed sealed block

[zhangchiqing]

This PR adds a sub command to the read-protocol-state util to query last executed and sealed block for execution node in order to prevent failure when extracting checkpoint from latest sealed block which might not be executed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 48 lines in your changes missing coverage. Please review.

Project coverage is 41.17%. Comparing base (72adf9e) to head (5e834eb).

Files with missing lines	Patch %	Lines
cmd/util/cmd/read-protocol-state/cmd/blocks.go	0.00%	48 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6857      +/-   ##
==========================================
- Coverage   41.18%   41.17%   -0.01%     
==========================================
  Files        2109     2109              
  Lines      185660   185705      +45     
==========================================
+ Hits        76460    76470      +10     
- Misses     102788   102821      +33     
- Partials     6412     6414       +2     

Flag	Coverage Δ
unittests	41.17% <0.00%> (-0.01%)	⬇️

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