Register the duration argument parser in the default parser registry

[0utplay]

This PR registers the new java.time.Duration argument parser to the default registry.

Without this registration the parser is not usable for annotation based commands.

See:

 Caused by: java.lang.IllegalArgumentException: Parameter 'arg4' in method 'addUserPermission' has parser 'java.time.Duration' but no parser exists for that type
[06.01 12:27:23.074] SCHWERWIEGEND:     at cloud.commandframework.annotations.AnnotationParser.lambda$buildArgument$6(AnnotationParser.java:590)
[06.01 12:27:23.074] SCHWERWIEGEND:     at java.base/java.util.Optional.orElseThrow(Optional.java:403)
[06.01 12:27:23.074] SCHWERWIEGEND:     at cloud.commandframework.annotations.AnnotationParser.buildArgument(AnnotationParser.java:589)
[06.01 12:27:23.074] SCHWERWIEGEND:     at cloud.commandframework.annotations.AnnotationParser.construct(AnnotationParser.java:441)
[06.01 12:27:23.074] SCHWERWIEGEND:     at cloud.commandframework.annotations.AnnotationParser.parse(AnnotationParser.java:309)
[06.01 12:27:23.074] SCHWERWIEGEND:     at eu.cloudnetservice.cloudnet.node.command.defaults.DefaultCommandProvider.register(DefaultCommandProvider.java:141)
[06.01 12:27:23.074] SCHWERWIEGEND:     at eu.cloudnetservice.cloudnet.node.command.defaults.DefaultCommandProvider.registerDefaultCommands(DefaultCommandProvider.java:208)
[06.01 12:27:23.074] SCHWERWIEGEND:     at eu.cloudnetservice.cloudnet.node.CloudNet.start(CloudNet.java:298)
[06.01 12:27:23.074] SCHWERWIEGEND:     at eu.cloudnetservice.cloudnet.node.BootLogic.main(BootLogic.java:51)
[06.01 12:27:23.074] SCHWERWIEGEND:     ... 13 more