Add helper function to get IMA abi address

[dmytrotkk]

This PR adds one small helper function to get IMA address of the main contract from IMA ABI file.

No performance changes, no tests added.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 86.22%. Comparing base (0e63517) to head (cd7aa65).

Files	Patch %	Lines
skale/utils/helper.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #559      +/-   ##
===========================================
- Coverage    86.25%   86.22%   -0.03%     
===========================================
  Files           73       73              
  Lines         2902     2904       +2     
===========================================
+ Hits          2503     2504       +1     
- Misses         399      400       +1     

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