Add field in callbacks data for custom calldata

[AdityaSripal]

Description

closes: #XXXX

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against the correct branch (see CONTRIBUTING.md).
• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Code follows the module structure standards and Go style guide.
• Wrote unit and integration tests.
• Updated relevant documentation (docs/).
• Added relevant godoc comments.
• Provide a conventional commit message to follow the repository standards.
• Include a descriptive changelog entry when appropriate. This may be left to the discretion of the PR reviewers. (e.g. chores should be omitted from changelog)
• Re-reviewed Files changed in the GitHub PR explorer.
• Review SonarCloud Report in the comment section below once CI passes.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 67.18%. Comparing base (2032604) to head (a04e780).

Files with missing lines	Patch %	Lines
modules/apps/callbacks/types/callbacks.go	76.92%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8353   +/-   ##
=======================================
  Coverage   67.17%   67.18%           
=======================================
  Files         280      280           
  Lines       19429    19442   +13     
=======================================
+ Hits        13052    13062   +10     
- Misses       5794     5796    +2     
- Partials      583      584    +1     

Flag	Coverage Δ
08-wasm	44.28% <ø> (ø)
ibc-go	68.87% <76.92%> (+<0.01%)	⬆️

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