feat(extension): 支持从 Maven 仓库下载并安装扩展包.

支持该功能后, 可以使用户更容易安装扩展包, 尤其是无需配置的扩展包.

scalabot-app/src/main/kotlin/util/Utils.kt

@@ -7,6 +7,7 @@ import org.eclipse.aether.artifact.Artifact
 import java.io.File
 import java.io.FileFilter
 import java.io.FilenameFilter
+import java.net.URL
 
 internal fun ByteArray.toHaxString(): String = ByteUtils.bytesToHexString(this)
 
@@ -93,4 +94,18 @@ private object UtilsInternal {
             log.debug { "All registered hook resources have been closed." }
         }, "Shutdown-AutoCloseable"))
     }
-}
+}
+
+fun URL.resolveToFile(canonical: Boolean = true): File {
+    if ("file" != protocol) {
+        throw ClassCastException("Only the URL of the `file` protocol can be converted into a File object.")
+    }
+
+    val urlString = toString().substringAfter(':')
+    val file = File(urlString)
+    return if (canonical) {
+        file.canonicalFile
+    } else {
+        file
+    }
+}