fix(ocpp): correct P0/P1 spec conformity gaps for OCPP 1.6 and 2.0.1

fix(ocpp): correct P0/P1 spec conformity gaps for OCPP 1.6 and 2.0.1

Addresses 7 non-conformities identified during algorithmic conformity audit:

P0 - OCPP-J protocol layer:
- Add MessageTypeNotSupported and RpcFrameworkError error codes (2.0.1 §4.3)
- Send CALLERROR with messageId "-1" on JSON parse failure (2.0.1 §4.2.3)
- Implement RetryBackOff reconnection algorithm using spec variables (2.0.1 §8.1-§8.3)

P1 - OCPP 1.6 logic fixes:
- Update authorization cache on Authorize/Start/StopTransaction responses
- Fix clearChargingProfiles to use AND logic per Errata 3.25

P1 - OCPP 2.0.1 security lifecycle:
- Add certificate signing retry with exponential back-off (A02.FR.17-19)
- Add security event notification queue with guaranteed delivery (A04.FR.02)
- Update authorization cache on AuthorizeResponse (C10.FR.04)

Infrastructure:
- Consolidate exponential backoff into computeExponentialBackOffDelay()
- Replace string literals with OCPP20OptionalVariableName enum entries
- Export OCPP16IdTagInfo type, make getAuthCache() non-optional on AuthStrategy
- Factor updateAuthorizationCache() into ServiceUtils for both 1.6 and 2.0