Remove assets level from micrgrid config

This was introduced as an additional nesting level. It doesn't seem to
be necessary and is not reflected in the current config files anyway, so
we remove it.

Signed-off-by: cwasicki <[email protected]>

Author: cwasicki

src/frequenz/data/microgrid/config.py

@@ -160,20 +160,6 @@ class BatteryConfig:
     """Capacity of the battery in Wh."""
 
 
-@dataclass(frozen=True)
-class AssetsConfig:
-    """Configuration of the assets in a microgrid."""
-
-    pv: dict[str, PVConfig] | None = None
-    """Configuration of the PV system."""
-
-    wind: dict[str, WindConfig] | None = None
-    """Configuration of the wind turbines."""
-
-    battery: dict[str, BatteryConfig] | None = None
-    """Configuration of the batteries."""
-
-
 # pylint: disable=too-many-instance-attributes
 @dataclass(frozen=True)
 class Metadata:
@@ -211,8 +197,14 @@ class MicrogridConfig:
     meta: Metadata | None = None
     """Metadata of the microgrid."""
 
-    assets: AssetsConfig | None = None
-    """Configuration of the assets in the microgrid."""
+    pv: dict[str, PVConfig] | None = None
+    """Configuration of the PV system."""
+
+    wind: dict[str, WindConfig] | None = None
+    """Configuration of the wind turbines."""
+
+    battery: dict[str, BatteryConfig] | None = None
+    """Configuration of the batteries."""
 
     ctype: dict[str, ComponentTypeConfig] = field(default_factory=dict)
     """Mapping of component category types to ac power component config."""
@@ -225,11 +217,9 @@ def __init__(self, config_dict: dict[str, Any]) -> None:
         """
         self.meta = Metadata(**(config_dict.get("meta") or {}))
 
-        self.assets = AssetsConfig(
-            pv=config_dict.get("pv") or {},
-            wind=config_dict.get("wind") or {},
-            battery=config_dict.get("battery") or {},
-        )
+        self.pv = config_dict.get("pv") or {}
+        self.wind = config_dict.get("wind") or {}
+        self.battery = config_dict.get("battery") or {}
 
         self.ctype = {
             ctype: ComponentTypeConfig(component_type=cast(ComponentType, ctype), **cfg)