Rewrite plugin, use filenames in lockfile

fixtures/projects/subprojects/multi-module/kotlin/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    java
+}
+
+allprojects {
+    repositories {
+        mavenCentral()
+    }
+}
+
+dependencies {
+    testImplementation("junit:junit:4.12")
+}

fixtures/projects/subprojects/multi-module/kotlin/child-a/build.gradle.kts

@@ -0,0 +1,8 @@
+
+plugins {
+    java
+}
+
+dependencies {
+    implementation("com.squareup.okio:okio:2.2.2")
+}

fixtures/projects/subprojects/multi-module/kotlin/child-b/build.gradle.kts

@@ -0,0 +1,9 @@
+
+plugins {
+    java
+}
+
+dependencies {
+    implementation(project(":child-a"))
+    implementation("com.squareup.moshi:moshi:1.8.0")
+}

fixtures/projects/subprojects/multi-module/kotlin/settings.gradle.kts

@@ -0,0 +1 @@
+include(":child-a", ":child-b")