Add health analyzer and medical scanner ECS (#6907)

Co-authored-by: fishfish458 <fishfish458>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/MedicalScanner/SharedHealthAnalyzerComponent.cs

@@ -0,0 +1,27 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.MedicalScanner
+{
+    public abstract class SharedHealthAnalyzerComponent : Component
+    {
+        /// <summary>
+        ///     On interacting with an entity retrieves the entity UID for use with getting the current damage of the mob.
+        /// </summary>
+        [Serializable, NetSerializable]
+        public sealed class HealthAnalyzerScannedUserMessage : BoundUserInterfaceMessage
+        {
+            public readonly EntityUid? TargetEntity;
+
+            public HealthAnalyzerScannedUserMessage(EntityUid? targetEntity)
+            {
+                TargetEntity = targetEntity;
+            }
+        }
+
+        [Serializable, NetSerializable]
+        public enum HealthAnalyzerUiKey : byte
+        {
+            Key
+        }
+    }
+}