feat(token-manager): add token manager for ITS

[milapsheth]

AXE-6085

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.56604% with 15 lines in your changes missing coverage. Please review.

Project coverage is 95.09%. Comparing base (9f3a1f3) to head (9d466fe).

Files with missing lines	Patch %	Lines
...llar-interchain-token-service/src/token_manager.rs	50.00%	12 Missing ⚠️
...llar-interchain-token-service/src/token_handler.rs	71.42%	2 Missing ⚠️
contracts/stellar-token-manager/src/contract.rs	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
- Coverage   95.17%   95.09%   -0.09%     
==========================================
  Files          61       65       +4     
  Lines        3423     3548     +125     
==========================================
+ Hits         3258     3374     +116     
- Misses        165      174       +9     

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