Adds the thermo-electric generator (#18840)

* Basic TEG start.

Connects via node group.

* Basic TEG test map

* Sensor monitoring basics, TEG circulator flow

* Basic power generation (it doesn't work)

* More sensor monitoring work

* Battery (SMES) monitoring system.

* Sensor monitoring fixes

Make it work properly when mapped.

* Test map improvements

* Revise TEG power output mechanism.

Now uses a fixed supplier with a custom ramping system.

* TEG test map fixes

* Make air alarms and pumps open UI on activate.

* Clean up thermo machines power switch.

Removed separate Enabled bool from the component that always matched the power receiver's state.

This enables adding a PowerSwitch component to give us alt click/verb menu.

* TEG but now fancy

* Make sensor monitoring console obviously WiP to mappers.

* Vending machine sound, because of course.

* Terrible, terrible graph background color

* Examine improvements for the TEG.

* Account for electrical power when equalizing gas mixtures.

* Get rid of the TegCirculatorArrow logic.

Use TimedDespawn instead. The "no show in right-click menuu" goes into a new general-purpose component.

Thanks Julian.

* Put big notice of "not ready, here's why" on the sensor monitoring console.

* TryGetComponent -> TryComp

* Lol there's a HideContextMenu tag

* Test fixes

* Guidebook for TEG

Fixed rotation on GuideEntityEmbed not working correctly.

Added Margin property to GuideEntityEmbed

* Make TEG power bar default to invisible.

So it doesn't appear in the guidebook and spawn menu.

Content.Server/SensorMonitoring/BatterySensorComponent.cs

@@ -0,0 +1,32 @@
+using Content.Server.Power.Components;
+
+namespace Content.Server.SensorMonitoring;
+
+/// <summary>
+/// Enables a battery entity (such as an SMES) to be monitored via the sensor monitoring console.
+/// </summary>
+/// <remarks>
+/// The entity should also have a <see cref="BatteryComponent"/> and <see cref="PowerNetworkBatteryComponent"/>.
+/// </remarks>
+[RegisterComponent]
+public sealed class BatterySensorComponent : Component
+{
+}
+
+/// <summary>
+/// Device network data sent by a <see cref="BatterySensorComponent"/>.
+/// </summary>
+/// <param name="Charge">The current energy charge of the battery, in joules (J).</param>
+/// <param name="MaxCharge">The maximum energy capacity of the battery, in joules (J).</param>
+/// <param name="Receiving">The current amount of power being received by the battery, in watts (W).</param>
+/// <param name="MaxReceiving">The maximum amount of power that can be received by the battery, in watts (W).</param>
+/// <param name="Supplying">The current amount of power being supplied by the battery, in watts (W).</param>
+/// <param name="MaxSupplying">The maximum amount of power that can be received by the battery, in watts (W).</param>
+public sealed record BatterySensorData(
+    float Charge,
+    float MaxCharge,
+    float Receiving,
+    float MaxReceiving,
+    float Supplying,
+    float MaxSupplying
+);