Two minor issues in JSONDeserializer

[kaiduanx]

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Description

--- There are two minor issues in JSONDeserializer

1. The id of RTPHeaderExt is Long while it is String in JSONSerializer.
2. We need to change CandidatePacketExtension to IceCandidatePacketExtension

Current behavior

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1. The id of RTPHeaderExt is Long
2. CandidatePacketExtension is used

Expected Behavior

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1. Change Long to String
2. Change CandidatePacketExtension to IceCandidatePackageExtension

Possible Solution

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Steps to reproduce

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Environment details

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