cloud_firestore should support setLogLevel(...) or enableLogging()

[yfujiki]

Flutter cloud_firestore does not seem to support setLogLevel(...) or enableLogging(), which can be used to debug network communication between flutter app and Firestore. Since Firestore communication is not over HTTP/S, common packet sniffer tools don't work, and there is no way to debug network communication otherwise.

Corresponding libraries for other platform (iOS/Android) have them (https://gist.github.com/katowulf/0475fb7a5907ed757f687aab6ed15878), so why not for Flutter?