Use python dataclasses instead of msb_client.ComplexDataFormat

[arthurGrigo]

Is your feature request related to a problem? Please describe.
Allowing the user to use a dataclass as event payload would allow reusability of code and simplification.

Describe the solution you'd like
The library should use reflection to parse the dataclasses provided by the user and generate its internal ComplexDataFormat on its own. This would allow a more streamlined usage as in the java client implementation.

Describe alternatives you've considered

Additional context