atmos alarmable visuals

Content.Client/Atmos/Monitor/AtmosAlarmableVisualsComponent.cs

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+using Content.Shared.Atmos.Monitor;
+
+namespace Content.Client.Atmos.Monitor;
+
+[RegisterComponent]
+public sealed class AtmosAlarmableVisualsComponent : Component
+{
+    [DataField("layerMap")]
+    public string LayerMap { get; } = string.Empty;
+
+    [DataField("alarmStates")]
+    public readonly Dictionary<AtmosMonitorAlarmType, string> AlarmStates = new();
+
+    [DataField("hideOnDepowered")]
+    public readonly List<string>? HideOnDepowered;
+
+    // eh...
+    [DataField("setOnDepowered")]
+    public readonly Dictionary<string, string>? SetOnDepowered;
+}