feat: support assets api 0.3

Signed-off-by: Richard Sandoval <rsandovaldev@gmail.com>

Author: sandovalrr

RELEASE_NOTES.md

@@ -15,6 +15,13 @@
 
 <!-- Here goes the main new features and examples or instructions on how to use them -->
 
+* Added client methods for the new `platformassets.v1alpha1` RPCs:
+  `list_gridpools()`, `list_gridpool_energy_schedules()`,
+  `list_market_topology_relations()`, `list_microgrids()`, and
+  `list_microgrid_sensors()`.
+* Added `component_ids` and `categories` filters to
+  `list_microgrid_electrical_components()`.
+
 ## Bug Fixes
 
 <!-- Here goes notable bug fixes that are worth a special mention or explanation -->

src/frequenz/client/assets/__init__.py

@@ -3,18 +3,48 @@
 
 """Assets API client."""
 
+from ._balancing_group import BalancingGroup
 from ._client import AssetsApiClient
 from ._delivery_area import DeliveryArea, EnergyMarketCodeType
+from ._gridpool import Gridpool
+from ._gridpool_energy_schedule import (
+    DeliveryDuration,
+    GridpoolEnergySchedule,
+    GridpoolEnergyScheduleDirection,
+    GridpoolEnergyScheduleTimeSeriesEntry,
+)
+from ._interval import Interval
 from ._lifetime import Lifetime
 from ._location import Location
+from ._market_location import MarketLocation, MarketLocationId, MarketLocationIdType
+from ._market_topology import (
+    MarketParticipation,
+    MarketParticipationType,
+    MarketTopologyRelation,
+)
 from ._microgrid import Microgrid, MicrogridStatus
+from ._sensor import Sensor
 
 __all__ = [
     "AssetsApiClient",
+    "BalancingGroup",
     "DeliveryArea",
+    "DeliveryDuration",
     "EnergyMarketCodeType",
+    "Gridpool",
+    "GridpoolEnergySchedule",
+    "GridpoolEnergyScheduleDirection",
+    "GridpoolEnergyScheduleTimeSeriesEntry",
+    "Interval",
     "Microgrid",
     "MicrogridStatus",
     "Location",
     "Lifetime",
+    "MarketLocation",
+    "MarketLocationId",
+    "MarketLocationIdType",
+    "MarketParticipation",
+    "MarketParticipationType",
+    "MarketTopologyRelation",
+    "Sensor",
 ]

src/frequenz/client/assets/_balancing_group.py

@@ -0,0 +1,19 @@
+# License: MIT
+# Copyright © 2026 Frequenz Energy-as-a-Service GmbH
+
+"""Balancing group definitions."""
+
+from dataclasses import dataclass
+
+from ._delivery_area import EnergyMarketCodeType
+
+
+@dataclass(frozen=True, kw_only=True)
+class BalancingGroup:
+    """A market balancing group identified by its market code."""
+
+    code: str | None
+    """The balancing group code."""
+
+    code_type: EnergyMarketCodeType | int
+    """The type of market code used to identify the balancing group."""

src/frequenz/client/assets/_balancing_group_proto.py

@@ -0,0 +1,20 @@
+# License: MIT
+# Copyright © 2026 Frequenz Energy-as-a-Service GmbH
+
+"""Conversion of BalancingGroup objects from protobuf messages."""
+
+from frequenz.api.common.v1alpha8.grid import balancing_group_pb2
+from frequenz.client.common import enum_proto
+
+from ._balancing_group import BalancingGroup
+from ._delivery_area import EnergyMarketCodeType
+
+
+def balancing_group_from_proto(
+    message: balancing_group_pb2.BalancingGroup,
+) -> BalancingGroup:
+    """Convert a protobuf balancing group message to a balancing group object."""
+    return BalancingGroup(
+        code=message.code or None,
+        code_type=enum_proto.enum_from_proto(message.code_type, EnergyMarketCodeType),
+    )