build: rename metamodel-gradle to model-api-gen-gradle including gradle pluginID

Author: nkoester

.gitignore

@@ -8,3 +8,5 @@
 kotlin_gen
 /version.txt
 /node_modules
+**/.ideaconfig
+**/.mpsconfig

metamodel-gradle-test/gradle/wrapper/gradle-wrapper.jar

@@ -23,7 +23,7 @@ repositories {
 plugins {
     kotlin("jvm") version "1.8.10"
     id("base")
-    id("org.modelix.metamodel.gradle")
+    id("org.modelix.model-api-gen")
 }
 
 val mps by configurations.creating

metamodel-gradle-test/build.gradle.kts renamed to model-api-gen-gradle-test/build.gradle.kts

@@ -1,7 +1,7 @@
 pluginManagement {
     val modelixCoreVersion: String = file("../version.txt").readText()
     plugins {
-        id("org.modelix.metamodel.gradle") version modelixCoreVersion
+        id("org.modelix.model-api-gen") version modelixCoreVersion
     }
     resolutionStrategy {
     }