Align DataSnapshot methods to @firebase/database DataSnapshot#926

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rhodgkins wants to merge 3 commits intofirebase:masterfrom

rhodgkins:datasnapshot-null-children

Commits on Aug 12, 2021

Test cases for DataSnapshot to align methods closer to @firebase/database
rhodgkins
committed
Aligned DataSnapshot methods to @firebase/database counterpart
rhodgkins
committed
Removed unneeded use of _.isArray with _.isObjectLike
rhodgkins
committed