Update Rtdb test sdk to allow json for CloudEvent#159

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TheIronDev merged 4 commits intomasterfrom

tystark.rtdb-v2-json

Aug 8, 2022

Commits on Aug 3, 2022

Update Rtdb test sdk to allow json for CloudEvent
TheIronDev
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Commits on Aug 4, 2022

Commits on Aug 5, 2022

Added ChangeLike type, and reverted an Object to object (lint errror)
TheIronDev
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