Support Redfish Task

[nicklela]

Per discussion in Redfish forum, BMC and UEFI should use Redfish Task to support secure boot database. We can create a driver to dispatch Redfish task to corresponding feature drivers.

Some idea:

• Create EDKII_REDFISH_TASK_DISPATCH_PROTOCOL to dispatch Redfish tasks. Feature driver register its URI to this protocol and wait for incoming task
• Integrate Redfish task into FEATURE_CORE_PROTOCOL.

[nicklela]

Since there is no spec way to provide Task state from host to BMC, a platform library will be provided for platform to implement this part. For example, OEM IPMI command or special Redfish URI for updating Redfish Task state or message.