fix: fix errors from groovy guru

build.gradle

@@ -7,6 +7,7 @@
 
 plugins {
     id 'groovy'
+    id 'java-gradle-plugin'
     id 'maven-publish'
 }
 
@@ -21,3 +22,9 @@ gradlePlugin {
         }
     }
 }
+
+task printClasspath {
+    doLast {
+        configurations.runtimeClasspath.each { println it }
+    }
+}

src/main/groovy/com/fahrecker/gradle/FlutterGradlePlugin.groovy

@@ -2,6 +2,7 @@ package com.fahrecker.gradle
 
 import org.gradle.api.Plugin
 import org.gradle.api.Project
+import org.gradle.api.provider.Property
 
 class FlutterGradlePlugin implements Plugin<Project> {
     void apply(Project project) {