fix: generator config clean up.

[laststylebender14]

Summary:

1. configuration file now only supports field name for curl only.
2. removed operation from sources as of now only query operation is supported.

Issue Reference(s):
Fixes #... (Replace "..." with the issue number)

Build & Testing:

• [ ] I ran cargo test successfully.
• [ ] I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• [ ] I have added relevant unit & integration tests.
• [ ] I have updated the documentation accordingly.
• [ ] I have performed a self-review of my code.
• [ ] PR follows the naming convention of <type>(<optional scope>): <title>

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 85.69%. Comparing base (84e57f2) to head (af15090).

Files	Patch %	Lines
src/cli/generator/config.rs	57.14%	3 Missing :warning:
src/cli/generator/generator.rs	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2251 +/- ## ========================================== + Coverage 85.67% 85.69% +0.01% ========================================== Files 219 219 Lines 21046 21039 -7 ========================================== - Hits 18031 18029 -2 + Misses 3015 3010 -5 ```

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