Issue:
fix(connector):  [Peach Payments] fix connector metadata deserialization

## Type of Change
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- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
fix connector metadata deserialization

Currently we deserialize to camelCase.
but dashboard always sends in snake_case.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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## Motivation and Context
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## How did you test it?
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<img width="836" height="924" alt="Screenshot 2025-10-14 at 2 13 20 PM" src="https://github.com/user-attachments/assets/15635e0c-128d-4bb6-80bb-6bfa38bcc424" />
<img width="938" height="935" alt="Screenshot 2025-10-14 at 2 13 38 PM" src="https://github.com/user-attachments/assets/20d7197f-f5e6-4adf-911b-67e80663ca7f" />


## Checklist
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- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Resolution:
<think>
PR Context:
- Title: fix(connector):  [Peach Payments] fix connector metadata deserialization
- Merged: 2025-10-14T11:48:24Z
- Files changed: 1 files
- Commits: 2 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
fix connector metadata deserialization

Currently we deserialize to camelCase.
but dashboard always sends in snake_case.

main pr - #9826

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the dat
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(connector):  [Peach Payments] fix connector metadata deserialization (#9827)
Co-authored-by: Gna
Files to modify:


**crates/hyperswitch_connectors/src/connectors/peachpayments/transformers.rs**
  Modify existing code