public Builder addShapeLinks(ShapeId id, List<ShapeLink> linkList) {
            this.shapes.put(id, linkList);
            return this;
        }
Adds a list of ShapeLinks to this ShapeId in the TraceFile's shapes map.

@param id       ShapeId.
@param linkList List of ShapeLinks corresponding to a ShapeId.
@return This builder.
smithy-codegen-core/src/main/java/software/amazon/smithy/codegen/core/trace/TraceFile.java