Issue:
[FEATURE] Create a delete endpoint for Config Table

### Feature Description

Add an API for deleting data from config table.

### Possible Implementation

Add the endpoint DELETE `config/{key}` for deleting the config key.

### Have you spent some time checking if this feature request has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

None

Resolution:
<think>
PR Context:
- Title: feat(router): added api for the deleting config key
- Merged: 2024-02-22T11:48:06Z
- Files changed: 8 files
- Commits: 9 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [x] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Added the api to delete config key
Fixes #3488 



<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** feat(router): added api for the deleting config key (#3554)
Co-authored-by: Kartikeya Hegde <karthih
Files to modify:


**crates/diesel_models/src/query/configs.rs**
  Modify existing code

**crates/router/src/core/configs.rs**
  Add:
    - function: pub::config_delete

**crates/router/src/db/configs.rs**
  Modify existing code

**crates/router/src/db/kafka_store.rs**
  Modify existing code

**crates/router/src/routes/app.rs**
  Modify existing code

**crates/router/src/routes/configs.rs**
  Add:
    - function: pub::config_key_delete

**crates/router/src/routes/lock_utils.rs**
  Modify existing code

**crates/router_env/src/logger/types.rs**
  Modify existing code