public ModelAssembler addImport(String importPath) {
        return addImport(Paths.get(Objects.requireNonNull(importPath, "importPath must not be null")));
    }
Adds an import to the assembler.

@param importPath Import path to add.
@return Returns the assembler.
@see #addImport(Path)
smithy-model/src/main/java/software/amazon/smithy/model/loader/ModelAssembler.java