static @NonNull Builder builder(@NonNull String key, @NonNull String value) {
        return builder().key(key).value(value);
    }
Creates a {@link MetaNode} builder.

@param key the meta key to set
@param value the meta value to set
@return the builder
@throws IllegalArgumentException if {@code key} is empty
api/src/main/java/net/luckperms/api/node/types/MetaNode.java