fix (rust): Checking overflow in Sliced function

[hemanth94]

Fixes #20239
This issue happens in release mode when integer overflow is wrapped.

We can use checked_add function of usize to check for overflow in release mode without letting it wrap.
Using expect, lets the code panic fulfilling the assertion.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.88%. Comparing base (f69768d) to head (978e45f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21207      +/-   ##
==========================================
- Coverage   79.88%   79.88%   -0.01%     
==========================================
  Files        1593     1593              
  Lines      227803   227806       +3     
  Branches     2600     2600              
==========================================
- Hits       181989   181983       -6     
- Misses      45217    45226       +9     
  Partials      597      597              

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