pump: add event interface

Add the PumpFailed and PumpRestored events for the pumps used in
Resevior & Pumping Unit based liquid cooling equipment. These
definitions are based on Redfish specificatio

pump: add event interface

Add the PumpFailed and PumpRestored events for the pumps used in
Resevior & Pumping Unit based liquid cooling equipment. These
definitions are based on Redfish specification of these events under
Environmental namespace[1].

[1] https://github.com/DMTF/Redfish-Publications/blob/main/registries/Environmental.1.2.0.json#L2254

Change-Id: I8ec4e95712a156023d654f83ad6d025c1cae6fe8
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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