Fix HTTP routing issues

[samtstern]

Fixes #1325 (some HTTP methods blocked)
Fixes #1314 (query params lost)

Tested with this simple function:

exports.httpFn = functions.https.onRequest((request, response) => {
    response.send({
        method: request.method,
        path: request.path, 
        query: request.query 
    });
});

Simple GET request

$ http -b GET http://localhost:5001/fir-dumpster/us-central1/httpFn
{
    "method": "GET",
    "path": "/",
    "query": {}
}

Simple DELETE request:

$ http -b DELETE http://localhost:5001/fir-dumpster/us-central1/httpFn
{
    "method": "DELETE",
    "path": "/",
    "query": {}
}

GET with query params:

$ http -b GET "http://localhost:5001/fir-dumpster/us-central1/httpFn?foo=bar&baz=qux"
{
    "method": "GET",
    "path": "/",
    "query": {
        "baz": "qux",
        "foo": "bar"
    }
}

GET with query params at subpath:

$ http -b GET "http://localhost:5001/fir-dumpster/us-central1/httpFn/subpath?foo=bar&baz=qux"
{
    "method": "GET",
    "path": "/subpath",
    "query": {
        "baz": "qux",
        "foo": "bar"
    }
}

[abeisgoat]

Had no idea this existed, dope.

[abeisgoat]

tests 🙏

[coveralls]

Coverage decreased (-0.03%) to 62.099% when pulling 39fda53 on ss-fix-http-routing into 30e6d6f on master.

[coveralls]

Coverage decreased (-0.03%) to 62.099% when pulling 39fda53 on ss-fix-http-routing into 30e6d6f on master.