Add extension method to check if a symbol is overriden in a template (#…

…12)

Add `scala.quoted` package with a single extension method to check if a
given definition overrides a given symbol

src/main/scala/steps/quoted/package.scala

@@ -0,0 +1,16 @@
+package steps.quoted
+
+import scala.quoted.*
+
+extension(using Quotes)(inline cls: quotes.reflect.Symbol)
+
+    /** Check if a given class, trait or object overrides a given definition
+      *
+      * @param cls The class, trait or object to inspect
+      * @param sym The symbol that should be overriden
+      * @return true if the definition is overriden, false otherwise
+      */
+    inline def overrides(inline sym: quotes.reflect.Symbol): Boolean =
+        sym.overridingSymbol(cls).exists
+
+end extension