use Duration() for http_retry_wait for nicer handling of units

planetiler-core/src/main/java/com/onthegomap/planetiler/config/PlanetilerConfig.java

@@ -41,7 +41,7 @@ public record PlanetilerConfig(
   String httpUserAgent,
   Duration httpTimeout,
   int httpRetries,
-  long httpRetryWait,
+  Duration httpRetryWait,
   long downloadChunkSizeMB,
   int downloadThreads,
   double downloadMaxBandwidth,
@@ -167,7 +167,7 @@ public record PlanetilerConfig(
         "Planetiler downloader (https://github.com/onthegomap/planetiler)"),
       arguments.getDuration("http_timeout", "Timeout to use when downloading files over HTTP", "30s"),
       arguments.getInteger("http_retries", "Retries to use when downloading files over HTTP", 1),
-      arguments.getLong("http_retry_wait", "How long (in milliseconds) to wait before retrying HTTP request", 5_000),
+      arguments.getDuration("http_retry_wait", "How long (in milliseconds) to wait before retrying HTTP request", "5s"),
       arguments.getLong("download_chunk_size_mb", "Size of file chunks to download in parallel in megabytes", 100),
       arguments.getInteger("download_threads", "Number of parallel threads to use when downloading each file", 1),
       Parse.bandwidth(arguments.getString("download_max_bandwidth",