Add support for cascading replication

[ivanyu]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 68.20%. Comparing base (408217a) to head (6780595).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
pglookout/cluster_monitor.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
- Coverage   69.26%   68.20%   -1.07%     
==========================================
  Files          10       10              
  Lines         999     1019      +20     
  Branches      174      178       +4     
==========================================
+ Hits          692      695       +3     
- Misses        252      266      +14     
- Partials       55       58       +3     

Flag	Coverage Δ
	68.20% <0.00%> (?)

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