refactor(interchain-token): use contractstorage

[nbayindirli]

AXE-7344

[codecov]

Codecov Report

Attention: Patch coverage is 97.54098% with 3 lines in your changes missing coverage. Please review.

Project coverage is 97.29%. Comparing base (7bd306d) to head (13b308b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
contracts/stellar-interchain-token/src/contract.rs	89.28%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #245      +/-   ##
==========================================
+ Coverage   97.25%   97.29%   +0.03%     
==========================================
  Files          69       69              
  Lines        3973     3953      -20     
==========================================
- Hits         3864     3846      -18     
+ Misses        109      107       -2     

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