Vaibhav/milestone iteration1

[VAIBHAVJINDAL3012]

Description

This PR contains the following changes:-

1. Condition that there must be a difference of atleast two Heimdall blocks between two Milestone
2. Milestone should satisfy block confimation rule in SideHandler

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.12% 🎉

Comparison is base (efbf823) 76.48% compared to head (397b508) 76.61%.
Report is 2 commits behind head on vaibhav/Milestone.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           vaibhav/Milestone    #1038      +/-   ##
=====================================================
+ Coverage              76.48%   76.61%   +0.12%     
=====================================================
  Files                     53       53              
  Lines                   5840     5871      +31     
=====================================================
+ Hits                    4467     4498      +31     
  Misses                  1116     1116              
  Partials                 257      257              

Files Changed	Coverage Δ
auth/ante.go	82.18% <100.00%> (+0.31%)	⬆️
checkpoint/handler_milestone.go	93.50% <100.00%> (+0.54%)	⬆️
checkpoint/keeper_milestone.go	88.43% <100.00%> (+1.41%)	⬆️
checkpoint/side_milestone_handler.go	94.11% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.