public Builder sources(Collection<Path> sources) {
            this.sources.clear();
            this.sources.get().addAll(sources);
            return this;
        }
Replaces the path to models that are considered "source" models of the
package being built.

@param sources Source models to set.
@return Returns the builder.
smithy-build/src/main/java/software/amazon/smithy/build/PluginContext.java