Change the directory structure to match our modules (#1451)

moshi-adapters/japicmp/build.gradle.kts

@@ -0,0 +1,32 @@
+import me.champeau.gradle.japicmp.JapicmpTask
+
+plugins {
+  `java-library`
+  id("me.champeau.gradle.japicmp")
+}
+
+val baseline = configurations.create("baseline")
+val latest = configurations.create("latest")
+
+dependencies {
+  baseline("com.squareup.moshi:moshi-adapters:1.12.0") {
+    isTransitive = false
+    isForce = true
+  }
+  latest(project(":moshi-adapters"))
+}
+
+val japicmp = tasks.register<JapicmpTask>("japicmp") {
+  dependsOn("jar")
+  oldClasspath = baseline
+  newClasspath = latest
+  isOnlyBinaryIncompatibleModified = true
+  isFailOnModification = true
+  txtOutputFile = file("$buildDir/reports/japi.txt")
+  isIgnoreMissingClasses = true
+  isIncludeSynthetic = true
+}
+
+tasks.named("check").configure {
+  dependsOn(japicmp)
+}