pool:check executable against next block number

[libotony]

Description

• Allow TX valid on next block to propagate.(eg. head at 19, TX with ref 20)
• Stops propagate TX that is expired on next block.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• New and existing E2E tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.51%. Comparing base (5b3db3a) to head (c3bab4f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #834      +/-   ##
==========================================
+ Coverage   62.50%   62.51%   +0.01%     
==========================================
  Files         208      208              
  Lines       18872    18872              
==========================================
+ Hits        11796    11798       +2     
+ Misses       5977     5975       -2     
  Partials     1099     1099              

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