public Builder addShapeLink(String idString, ShapeLink link) {
            return addShapeLink(ShapeId.from(idString), link);
        }
Adds a ShapeLink to this ShapeId in the TraceFile's shapes map.

@param idString ShapeId represented as a string.
@param link     ShapeLink corresponding to ShapeId
@return This builder.
smithy-codegen-core/src/main/java/software/amazon/smithy/codegen/core/trace/TraceFile.java