feat(ScalaLangDoc): support Scala | 支持 Scala

src/test/java/io/github/linwancen/plugin/show/demo/ScalaClass.scala

@@ -0,0 +1,21 @@
+/**
+ * Class
+ * [[ScalaClass#fun2()]]
+ */
+class ScalaClass {
+  /**
+   * fun
+   * call [[ScalaClass#fun2()]] method
+   */
+  private def fun(): Unit = {
+    fun2()
+  }
+
+  /**
+   * fun2
+   * @author name
+   */
+  def fun2(): Unit = {
+
+  }
+}