Add a class to handle RDE commands

This class is used to process RDE packets received from BIOS-BMC
circular buffer. RdeCommandHandler will manage dictionary data,
decode RDE BEJ encoded payloads an

Add a class to handle RDE commands

This class is used to process RDE packets received from BIOS-BMC
circular buffer. RdeCommandHandler will manage dictionary data,
decode RDE BEJ encoded payloads and push them to the ExternalStorer.

Tested:
Tested this with unit tests.

Signed-off-by: Kasun Athukorala <kasunath@google.com>
Change-Id: Ic66e4e4e2afa523906835713d36015457f324fcc

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