Firestore context params bind

[Tomer781]

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While using the library to emulate a firestore document event, I noticed that I have to send the params separately. This is a suggestion to bind the params from the DocumentSnapshot refPath property.

enable this usage:

const snap = test.firestore.makeDocumentSnapshot({}, 'wildcard/111/anotherwildcard/111');
      const wrapped = test.wrap(myFunctions.matchApartmentToUsers);
      return wrapped(snap).then(() => {});

instead of:

const snap = test.firestore.makeDocumentSnapshot({}, 'wildcard/111/anotherwildcard/111');
      const wrapped = test.wrap(myFunctions.matchApartmentToUsers);
      return wrapped(snap, {params:{wildcard:"111",anotherwildcard:"111"}}).then(() => {});