OCPP 2.0.1 California Pricing Requirements: implement callbacks

[maaikez]

OCPP Version

OCPP2.0.1

Describe the problem

For OCPP 1.6, California pricing requirements were implemented, but not for 2.0.1 yet.
Also see ticket #376 and branch feature/376-ocpp-201-california-pricing-requirements-tariff-and-cost for both libocpp and everest core.

See chapter 4 of https://www.openchargealliance.org/uploads/files/ocpp_and_dms_evse_regulation-v2.0.pdf

Describe your solution

• Implement callbacks needed for California Pricing Requirements
• Implement callbacks for TariffAndCost
• Implement callbacks for DisplayMessage
• Implement callbacks based on customData of other requests.

Additional context

No response