[Feature]: SearXNG as a saerch engine

### Problem or Use Case

SearXNG is a privacy-focused search engine that would make a good addition.

### Proposed Solution

I added it in my own fork that I will make a PR for

### Alternatives Considered

_No response_

### Feature Type

New tool

### Scope

None

### Contribution

- [ ] I'd like to implement this myself and submit a PR

### Debug Report (optional)

```shell

```