Remove intermediate tasks from Bitcoindevkit group

This ensures they don't show up when using ./gradlew :jvm:tasks. The
only two tasks that will appear in the end will be buildJvmLib and
buildAndroidLib.

jvm/build.gradle.kts

@@ -6,8 +6,12 @@ plugins {
     id("java-library")
     id("maven-publish")
     id("signing")
+
+    // API docs
     id("org.jetbrains.dokka") version "1.6.10"
-    id("org.bitcoindevkit.plugin.generate-bdk-bindings")
+
+    // Custom plugin to generate the native libs and bindings file
+    id("org.bitcoindevkit.plugins.generate-jvm-bindings")
 }
 
 java {