Separate plugins for different Gradle APIs

plugin/gradle81/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    `plugin-conventions`
+}
+
+dependencies {
+    implementation(project(":plugin:gradle8"))
+    compileOnly(libs.gradle.api.get81())
+}
+
+tasks.shadowJar {
+    archiveFileName = "plugin-gradle81.jar"
+}