Function isURL

isURL(value: string): boolean
Checks whether a given string is a valid absolute URL.

This function uses the native URL constructor to determine if the input is a valid, absolute URL with a supported protocol (e.g., http, https, ftp, etc.).
Parameters
- value: string
  The string to validate as a URL.
Returns boolean
- true if the string is a valid absolute URL; otherwise, false.
Example
```
isURL('https://example.com'); // true
isURL('ftp://files.example.com'); // true
isURL('invalid-url'); // false
isURL('/relative/path'); // false
```
- Defined in src/string/validate.ts:83