Add nitrous oxide decomposition reaction (#22738)

Co-authored-by: whateverusername0 <whateveremail>
Co-authored-by: Kevin Zheng <kevinz5000@gmail.com>

Content.Server/Atmos/Reactions/N2ODecompositionReaction.cs

@@ -0,0 +1,28 @@
+using Content.Server.Atmos.EntitySystems;
+using Content.Shared.Atmos;
+using JetBrains.Annotations;
+
+namespace Content.Server.Atmos.Reactions;
+
+/// <summary>
+///     Decomposes Nitrous Oxide into Nitrogen and Oxygen.
+/// </summary>
+[UsedImplicitly]
+public sealed partial class N2ODecompositionReaction : IGasReactionEffect
+{
+    public ReactionResult React(GasMixture mixture, IGasMixtureHolder? holder, AtmosphereSystem atmosphereSystem, float heatScale)
+    {
+        var cacheN2O = mixture.GetMoles(Gas.NitrousOxide);
+
+        var burnedFuel = cacheN2O / Atmospherics.N2ODecompositionRate;
+
+        if (burnedFuel <= 0 || cacheN2O - burnedFuel < 0)
+            return ReactionResult.NoReaction;
+
+        mixture.AdjustMoles(Gas.NitrousOxide, -burnedFuel);
+        mixture.AdjustMoles(Gas.Nitrogen, burnedFuel);
+        mixture.AdjustMoles(Gas.Oxygen, burnedFuel / 2);
+
+        return ReactionResult.Reacting;
+    }
+}