Add a method to get or edit a query string in the current URL

## Description

When manipulating a current URL with many query strings added for differents scenarios, it becomes cumbersome to manage every use case.

We should be able to add, or edit an existing query strings while preserving the current query strings.

## Proposal

A new method to add or edit query strings.

```php
use function Folded\addOrEditQueryStrings;

// current URL: /?view=feed

addOrEditQueryStrings(["lang" => "en", "page" => 42]);

// current URL: /?view=feed&lang=en&page=42
```

## Worarkound solutions

Managing every different query strings (hardly reliable).

## Notes

None.