Move entity effects definitions to shared (#35614)

* Move entity effects to shared

* relocate spawning to server

* Generic version of EntityEffect for just raising event.

* genericise everything

* oops forgot to push you

* some condensation

* finish rebas

* unwhite the space

* oops forgot nuke

* bad rebase fix

* useless annotations begone

---------

Co-authored-by: EmoGarbage404 <retron404@gmail.com>

Content.Shared/EntityEffects/Effects/AddToSolutionReaction.cs

@@ -0,0 +1,35 @@
+using Content.Shared.Chemistry.EntitySystems;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.EntityEffects.Effects
+{
+    public sealed partial class AddToSolutionReaction : EntityEffect
+    {
+        [DataField("solution")]
+        private string _solution = "reagents";
+
+        public override void Effect(EntityEffectBaseArgs args)
+        {
+            if (args is EntityEffectReagentArgs reagentArgs) {
+                if (reagentArgs.Reagent == null)
+                    return;
+
+                // TODO see if this is correct
+                var solutionContainerSystem = reagentArgs.EntityManager.System<SharedSolutionContainerSystem>();
+                if (!solutionContainerSystem.TryGetSolution(reagentArgs.TargetEntity, _solution, out var solutionContainer))
+                    return;
+
+                if (solutionContainerSystem.TryAddReagent(solutionContainer.Value, reagentArgs.Reagent.ID, reagentArgs.Quantity, out var accepted))
+                    reagentArgs.Source?.RemoveReagent(reagentArgs.Reagent.ID, accepted);
+
+                return;
+            }
+
+            // TODO: Someone needs to figure out how to do this for non-reagent effects.
+            throw new NotImplementedException();
+        }
+
+        protected override string? ReagentEffectGuidebookText(IPrototypeManager prototype, IEntitySystemManager entSys) =>
+            Loc.GetString("reagent-effect-guidebook-add-to-solution-reaction", ("chance", Probability));
+    }
+}