feat: soroban xcall contracts

[bishalbikram]

Description:

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Changelog Entry

version: <log entry>

Checklist:

• I have performed a self-review of my own code
• I have documented my code in accordance with the documentation guidelines
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have run the unit tests
• I only have one commit (if not, squash them into one commit).
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Please review the CONTRIBUTING.md file for detailed contributing guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.33%. Comparing base (3284b2f) to head (89e9ac8).
Report is 49 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##               main     #297       +/-   ##
=============================================
- Coverage     89.47%   69.33%   -20.15%     
+ Complexity       77       76        -1     
=============================================
  Files            42       42               
  Lines          2698     2638       -60     
  Branches         37       37               
=============================================
- Hits           2414     1829      -585     
- Misses          267      792      +525     
  Partials         17       17               

Flag	Coverage Δ
solidity	88.41% <ø> (ø)

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see 20 files with indirect coverage changes

[ibrizsabin]

Few comments to resolve.