feat: soroban xcall contracts

[bishalbikram]

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Changelog Entry

version: <log entry>

Checklist:

• [x] I have performed a self-review of my own code
• [ ] I have documented my code in accordance with the documentation guidelines
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 63.45%. Comparing base (f14e392) to head (4a5fcaa). Report is 6 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/icon-project/xcall-multi/pull/297?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icon-project) ```diff @@ Coverage Diff @@ ## main #297 +/- ## ============================================ - Coverage 63.52% 63.45% -0.08% Complexity 76 76 ============================================ Files 42 42 Lines 2646 2657 +11 Branches 37 37 ============================================ + Hits 1681 1686 +5 - Misses 948 954 +6 Partials 17 17 ``` | [Flag](https://app.codecov.io/gh/icon-project/xcall-multi/pull/297/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icon-project) | Coverage Δ | | |---|---|---| | [solidity](https://app.codecov.io/gh/icon-project/xcall-multi/pull/297/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icon-project) | `58.91% <ø> (-0.30%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icon-project#carryforward-flags-in-the-pull-request-comment) to find out more. [see 7 files with indirect coverage changes](https://app.codecov.io/gh/icon-project/xcall-multi/pull/297/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icon-project)