feat: gradle support (#10)

Switching to the ScaffoldIt Gradle Plugin adding:
- HytaleServer.jar via the official Hytale maven
- Monorepo support via `common {}` block
- Kotlin support via `useKotlin()` function
- Hot-reloading using DCEVM JVM and IDEA
- Automatic manifest in-place generation
- Automatic source path scaffolding
- Source-linked Devserver for zero jar
- Source-linked Asset Editor

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists