uuid support?

[abedcodes]

Hi @lazychaser thanks for this amazing package. I'm using uuid as my primary keys. is there any considerations to take? i looked at the source,columns method inside NestedSet class, and parent_id column key type is unsigned big integer. using $table->nestedSet() gives no ways of setting this field type and there is nothing to publish for this package. you could build 3 columns manually in the migration but this shouldn't be the way to go.

thanks in advance 👍