public BuildParameterBuilder projection(String projection) {
        this.projection = projection;
        return this;
    }
Ensures that only the given projection is built. All other
projections are skipped.

<p>This is not the same as calling {@link #projectionSource}.

@param projection Projection to build, excluding others.
@return Returns the builder.
smithy-cli/src/main/java/software/amazon/smithy/cli/BuildParameterBuilder.java