feat: Remove deprecated dataclass (#699)

### Changes included in this PR

#### Breaking changes:

- Removed all the deprecated dataclasses from `call.py` and
`call_result.py` for OCPP 1.6 and OCPP 2.0.1.
- Removed logic in `charge_point.py` where the deprecated dataclasses
were being handled.

### Impact

- User's need to update the codebase and migrate from old dataclass
nomenclature to the new one:
    - The old dataclasses had `Payload` at the end of the class name.
- The new dataclasses don't have the `Payload` at the end of the class
name.

### Checklist

1. [x] Does your submission pass the existing tests?
2. [ ] Are there new tests that cover these additions/changes? 
3. [x] Have you linted your code locally before submission?

Author: jainmohit2001

ocpp/charge_point.py

@@ -403,9 +403,6 @@ async def call(
         )
 
         action_name = payload.__class__.__name__
-        # Due to deprecated call and callresults, remove in the future.
-        if "Payload" in payload.__class__.__name__:
-            action_name = payload.__class__.__name__[:-7]
 
         call = Call(
             unique_id=unique_id,