feat: Implement reply for two way messages

[AntonAndell]

Description:

Commit Message

type: commit message

see the guidelines for commit messages.

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).
• I have a descriptive commit message that adheres to the commit message guidelines

Please review the CONTRIBUTING.md file for detailed contributing guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0f8bff9) 69.63% compared to head (33259ca) 69.48%.

Additional details and impacted files

@@                                Coverage Diff                                 @@
##             development/177-xcall-future-proof-messaging     #224      +/-   ##
==================================================================================
- Coverage                                           69.63%   69.48%   -0.15%     
  Complexity                                             64       64              
==================================================================================
  Files                                                  40       40              
  Lines                                                2233     2209      -24     
  Branches                                               29       24       -5     
==================================================================================
- Hits                                                 1555     1535      -20     
+ Misses                                                665      664       -1     
+ Partials                                               13       10       -3     

Flag	Coverage Δ
solidity	86.07% <ø> (ø)

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Files	Coverage Δ
...in/java/foundation/icon/xcall/CallServiceImpl.java	86.06% <ø> (+0.29%)	⬆️