Enhance performance

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt

@@ -102,23 +102,27 @@ fun UByte.fixToUHex(): String = if (this.toInt() in 0..9) "0${this.toString(16).
  */
 fun String.hexToBytes(): ByteArray =
     this.split(" ")
+        .asSequence()
         .filterNot { it.isEmpty() }
         .map { s -> s.toUByte(16).toByte() }
+        .toList()
         .toByteArray()
 
 /**
  * 每 2 char 为一组, 转换 Hex 为 [ByteArray]
  */
 fun String.chunkedHexToBytes(): ByteArray =
-    this.chunked(2).map { it.toUByte(16).toByte() }.toByteArray()
+    this.asSequence().chunked(2).map { (it[0].toString() + it[1]).toUByte(16).toByte() }.toList().toByteArray()
 
 /**
  * 将无符号 Hex 转为 [UByteArray], 有根据 hex 的 [hashCode] 建立的缓存.
  */
 fun String.hexToUBytes(): UByteArray =
     this.split(" ")
+        .asSequence()
         .filterNot { it.isEmpty() }
         .map { s -> s.toUByte(16) }
+        .toList()
         .toUByteArray()
 
 /**