Migrate MicrogridConfig from lib-notebooks repo (#18)

This pull request introduces a new, robust configuration system for
microgrids, centered around the new `MicrogridConfig` class and related
dataclasses. It also removes placeholder code and associated tests, and
adds comprehensive unit tests for the new configuration logic. The
changes improve the structure, maintainability, and test coverage of the
codebase.

Configuration system implementation:

* Added a new `MicrogridConfig` class, along with supporting dataclasses
such as `ComponentTypeConfig`, `PVConfig`, `WindConfig`,
`BatteryConfig`, and `Metadata`. This system provides structured,
validated configuration management for microgrids, including methods for
loading from TOML files and retrieving component information.
* Updated dependencies in `pyproject.toml` to include
`marshmallow-dataclass`, required for schema validation in the new
configuration classes.

Copied from here with minimal adjustments:
https://github.com/frequenz-floss/frequenz-lib-notebooks/blob/17953b89e18dadb9ece1117ca1a6cc28873aea74/src/frequenz/data/microgrid/config.py#L1

Author: cwasicki

RELEASE_NOTES.md

@@ -10,7 +10,7 @@
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
+* Adds a configuration class for microgrids copied from `frequenz-floss/lib-notebooks`.
 
 ## Bug Fixes
 

pyproject.toml

@@ -28,6 +28,7 @@ classifiers = [
 requires-python = ">= 3.11, < 4"
 # TODO(cookiecutter): Remove and add more dependencies if appropriate
 dependencies = [
+  "marshmallow-dataclass>=8.7.1,<9",
   "typing-extensions >= 4.14.1, < 5",
 ]
 dynamic = ["version"]

src/frequenz/gridpool/__init__.py

@@ -1,25 +1,8 @@
 # License: MIT
 # Copyright © 2025 Frequenz Energy-as-a-Service GmbH
 
-"""High-level interface to grid pools for the Frequenz platform..
+"""High-level interface to grid pools for the Frequenz platform."""
 
-TODO(cookiecutter): Add a more descriptive module description.
-"""
+from ._microgrid_config import MicrogridConfig
 
-
-# TODO(cookiecutter): Remove this function
-def delete_me(*, blow_up: bool = False) -> bool:
-    """Do stuff for demonstration purposes.
-
-    Args:
-        blow_up: If True, raise an exception.
-
-    Returns:
-        True if no exception was raised.
-
-    Raises:
-        RuntimeError: if blow_up is True.
-    """
-    if blow_up:
-        raise RuntimeError("This function should be removed!")
-    return True
+__all__ = ["MicrogridConfig"]