private ShapeId getShapeIdFromString(String id) {
        try {
            return ShapeId.from(id);
        } catch (ShapeIdSyntaxException e) {
            throw new SmithyBuildException(String.format("'%s' must be a valid, absolute shape ID", id));
        }
    }
Gets the map of shape ids to be renamed.

@return The map of shapes to rename.
smithy-build/src/main/java/software/amazon/smithy/build/transforms/RenameShapes.java