Add modules for each component component in frequenz.sdk.microgrid

[ela-kotulska-frequenz]

What's needed?

Now in frequenz.sdk.microgrid we have modules like: component_errors, component_states, component_type.

Instead of we could have module for each component category. The same as in frequenz-api
It would:

• Simplify findings features of the component. Now it is not clear what is where.
• Instead of implementing class BatteryErrorCode it would be possible to implement class ErrorCode in battery submodule and import it as battery.ErrorCode
• It would be more consistent with the api.

Proposed solution

No response

Use cases

Easier to implement attributes of the component message.
Easier for user to find correct type.
Easier to import code.

Alternatives and workarounds

No response

Additional context

No response