Inconsistent typings across @firebase/database and @firebase/database-types

[MathBunny]

While working on this PR I came across several inconsistencies with the typings across @firebase/database and @firebase/database-typing. For example, there are multiple cases where unknown is used in-place of any.

In an ideal world, there is Database from @firebase/database implementing FirebaseDatabase from @firebase/database-types, this would ensure that the two are compatible with one another.

I intend to use the type FirebaseDatabase as an interface for Database instances but it isn't possible in TS right now. I attempted the change myself but it got involved after a point because differences span a bit more than just replacing unknown to any once the Query class gets involved.

Thanks!

[google-oss-bot]

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[MathBunny]

Looks like this won't be a simple fix, and was likely intentional. Closing this for now.