feat: add support of transforming custom command

[hetangmodi-crest]

Issue number: ADDON-82004

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

Changes

Since we were blocked by Splunk SDK for Python on this functionality and now are unblocked, UCC now supports creation of transforming custom commands as well.

User experience

Users would now be able to create transforming custom commands via UCC.

Checklist

If an item doesn't apply to your changes, leave it unchecked.

Review

• self-review - I have performed a self-review of this change according to the development guidelines
• Changes are documented. The documentation is understandable, examples work (more info)
• PR title and description follows the contributing principles
• meeting - I have scheduled a meeting or recorded a demo to explain these changes (if there is a video, put a link below and in the ticket)

Tests

See the testing doc.

• Unit - tests have been added/modified to cover the changes
• Smoke - tests have been added/modified to cover the changes
• UI - tests have been added/modified to cover the changes
• coverage - I have checked the code coverage of my changes (see more)

Demo/meeting:

Reviewers are encouraged to request meetings or demos if any part of the change is unclear

[kkedziak-splunk]

Works fine

[github-actions]

Code Coverage 🎉

Type	PR	Develop	Change	Status
Line Coverage	94.47%	94.46%	0.02%	🟢 Increased
Branch Coverage	91.07%	91.02%	0.05%	🟢 Increased