Improve the "missing query string" error message

[markandrus]

We're using Apollo Router. One of our customers was experimenting with our API using Postman. They issued a GraphQL request via HTTP GET, but did not put their GraphQL query inside of the query parameter within their URL. Instead, they put it in the request body. This triggered this code in Apollo Router, which caused Apollo Router to return the following error:

{
    "message": "Invalid GraphQL request",
    "extensions": {
        "details": "missing query string",
        "code": "INVALID_GRAPHQL_REQUEST"
    }
}

Can we make this error message clearer? For example,

{
    "message": "Invalid GraphQL request",
    "extensions": {
        "details": "This GraphQL request was sent via an HTTP GET request, but it is missing a \"query\" parameter in the URL",
        "code": "INVALID_GRAPHQL_REQUEST"
    }
}