Add support for FirebseStorage For JVM Target

[Krupal60]

public actual val Firebase.storage: FirebaseStorage
get() = TODO("Not yet implemented")

need support of getDownloadUrl() etc in JVM Target

[AbelVolpi]

I'm facing the same problem, I noticed there's this opened PR implementing this, but I'm not able to run the project on this branch. So I can't import it locally in my personal project

I would really appreciate it if someone could help me run the project correctly and import it locally.