public ModelAssembler putMetadata(String name, Node value) {
        metadata.put(Objects.requireNonNull(name), Objects.requireNonNull(value));
        return this;
    }
Adds metadata to the model.

@param name Metadata key to set.
@param value Metadata value to set.
@return Returns the model assembler.
smithy-model/src/main/java/software/amazon/smithy/model/loader/ModelAssembler.java