Clean up the code (#11)

- **Remove the MicrogridApiClient ABC**
- **Rename the class to `ApiClient`**
- **Unify the importing of protobuf generated files**
- **Don't disable the check `use-implicit-booleaness-not-comparison`**
- **Avoid disabling the `unused-argument` check for the whole file**
- **Import `grpc.aio` instead of `grpc`**
- **Improve `TypeVar` for `ComponentData`**
- **Fix import formatting**
- **Return `Self` in `from_proto()` constructors**
- **Remove nonexistent stub from the mock**
- **Add overrides to sub-classes**
- **Remove unnecessary import future**

Author: llucax

RELEASE_NOTES.md

@@ -6,12 +6,8 @@ Code import from the [SDK v1.0.0-rc5](https://github.com/frequenz-floss/frequenz
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+Changes compared to the code in the SDK v1.0.0-rc5 release:
 
-## New Features
-
-<!-- Here goes the main new features and examples or instructions on how to use them -->
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->
+* The `MicrogridGrpcClient` class was renamed to `ApiClient`.
+* The `MicrogridApiClient` abstract base class was removed, use `ApiClient` instead.
+* The `Connection` class is now a `dataclass` instead of a `NamedTuple`. If you use the tuple-like interface (`connection[0]`, etc.) you should use the named attributes instead or use [`dataclasses.astuple()`](https://docs.python.org/3/library/dataclasses.html#dataclasses.astuple) to convert it to a tuple.

src/frequenz/client/microgrid/__init__.py

@@ -1,4 +1,40 @@
 # License: MIT
 # Copyright © 2022 Frequenz Energy-as-a-Service GmbH
 
-"""Client to connect to the Microgrid API."""
+"""Client to connect to the Microgrid API.
+
+This package provides a low-level interface for interacting with the microgrid API.
+"""
+
+
+from ._client import ApiClient
+from ._component import Component
+from ._component_data import (
+    BatteryData,
+    ComponentData,
+    EVChargerData,
+    InverterData,
+    MeterData,
+)
+from ._component_states import EVChargerCableState, EVChargerComponentState
+from ._connection import Connection
+from ._metadata import Location, Metadata
+from ._retry import ExponentialBackoff, LinearBackoff, RetryStrategy
+
+__all__ = [
+    "ApiClient",
+    "BatteryData",
+    "Component",
+    "ComponentData",
+    "Connection",
+    "EVChargerCableState",
+    "EVChargerComponentState",
+    "EVChargerData",
+    "ExponentialBackoff",
+    "InverterData",
+    "LinearBackoff",
+    "Location",
+    "Metadata",
+    "MeterData",
+    "RetryStrategy",
+]