[api] Add speed_optimized proto option for hot encode paths

Add a new (speed_optimized) message option that emits
__attribute__((optimize("O2"))) on the generated encode() and
calculate_size() methods. Under -Os, GCC does not inline the small
ProtoEncode helpers (write_raw_byte, encode_varint, etc.) into the
generated methods, causing significant overhead on hot paths.

Apply to SensorStateResponse and BluetoothLERawAdvertisementsResponse
which are the highest-frequency encode paths.

script/api_protobuf/api_protobuf.py

@@ -2682,8 +2682,7 @@ def build_message_type(
     # Check if this message wants speed-optimized encode/calculate_size.
     # When set, __attribute__((optimize("O2"))) is added to the definitions
     # so GCC inlines the small ProtoEncode helpers even under -Os.
-    speed_opt = getattr(pb, "speed_optimized", None)
-    is_speed_optimized = speed_opt is not None and get_opt(desc, speed_opt, False)
+    is_speed_optimized = get_opt(desc, pb.speed_optimized, False)
     speed_attr = '__attribute__((optimize("O2"))) ' if is_speed_optimized else ""
 
     # Only generate encode method if this message needs encoding and has fields