Fix for query params in external example url

[joelrosario]

What:

Added a fix for the code handling query params in external example, such as this:

{
  "http-request": {
    "method": "GET",
    "path": "/data?enabled=true"
  },
  "http-responses": {
    "status": 200,
    "body": []
  }
}

The query param is in the URL, and the fix ensures that example is loaded.

Why:

Query params were mistakenly treated as part of the URL, resulting in the example not being loaded.

How:

Added better path handling to the ExampleFromFile class.

Checklist:

• [ ] Documentation added to the README.md OR link to PR on https://github.com/specmatic/specmatic-documentation
• [x] Tests
• [ ] Sonar Quality Gate