Add: Support for Custom Backend with different key types

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.53%. Comparing base (aeeec6b) to head (37d6be9).
Report is 38 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13529      +/-   ##
============================================
- Coverage     14.19%   13.53%   -0.66%     
- Complexity      668      736      +68     
============================================
  Files           255      255              
  Lines         11551    11551              
  Branches       1204     1204              
============================================
- Hits           1640     1564      -76     
- Misses         9887     9973      +86     
+ Partials         24       14      -10     

Flag	Coverage Δ
integration_tests	13.53% <ø> (-0.66%)	⬇️

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