Add client completion type for remaining joined strings

[MrSlimeDiamond]

SpongeAPI | Sponge

This adds ClientCompletionTypes.REMAINING_JOINED_STRINGS for value parsers.

So now custom value parsers, returning custom types, can take a joined string of inputs.

In value parsers:

@Override
public List<ClientCompletionType> clientCompletionType() {
    return List.of(ClientCompletionTypes.REMAINING_JOINED_STRINGS.get());
}