Adding missing ISO2 state machine

### Describe the problem

Implementing the ISO15118-2 state machine in libiso15118.
Every state should be commited separately and with unit tests.

### EVerest Domain

ISO15118

### Affected EVerest Module

libiso15118

### Solution

Adding states to state machine:

- SessionSetup
- ServiceDiscovery
- ServiceDetail
- PaymentServiceSelection
- CertificateUpdate
- CertificateInstallation
- PaymentDetails
- Authorization
- ChargeParameterDiscovery
- PowerDelivery
- SessionStop
- MeteringReceipt
- ChargingStatus
- CableCheck
- PreCharge
- CurrentDemand
- WeldingDetection