Using functions in the ruleset

Do you have an example of using function in the workset

I tried with the following ruleset and function but it fails to run

```
# Source: https://docs.stoplight.io/docs/spectral/4dec24461f3af-open-api-rules
extends:
- spectral:oas
functionsDir: "./functions"
functions:
- consistent-response-body
rules:
info-contact: off
no-$ref-siblings: off
oas2-api-host: off
oas2-api-schemes: off
openapi-tags: off
operation-description: off
operation-tags: off
operation-tag-defined: off

# Note: The Spectral VSCode extension will not display "hint" messages, so
# use "info" rather than "hint".
# just a note here

az-additional-properties-and-properties:
description: Don't specify additionalProperties as a sibling of properties.
severity: warn
formats: ["oas2", "oas3"]
given: $..[?(@object() && @.type === 'object' && @.properties)]
then:
field: additionalProperties
function: falsy

az-consistent-response-body:
description: Ensure the get, put, and patch response body schemas are consistent.
message: "{{error}}"
severity: warn
formats: ["oas2"]
given: $.paths.*
then:
function: consistent-response-body
```

and function

```
// If put or patch is a create (returns 201), then verify that put, get, and patch response body
// schemas are consistent.

// path Item should be a [path item object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#pathItemObject).
// This function assumes it is running on a resolved doc.
module.exports = (pathItem, _opts, paths) => {
if (pathItem === null || typeof pathItem !== 'object') {
return [];
}
const path = paths.path || paths.target || [];

const errors = [];

// resource schema is create operation response schema
const createResponseSchema = ((op) => op?.responses?.['201']?.schema);
const resourceSchema = createResponseSchema(pathItem.put) || createResponseSchema(pathItem.patch);
if (resourceSchema) {
['put', 'get', 'patch'].forEach((method) => {
const responseSchema = pathItem[method]?.responses?.['200']?.schema;
if (responseSchema && responseSchema !== resourceSchema) {
errors.push({
message: 'Response body schema does not match create response body schema.',
path: [...path, method, 'responses', '200', 'schema'],
});
}
});
}

return errors;
};
```

This is based upon the azure ruleset [azure-api-style-guide](https://github.com/Azure/azure-api-style-guide)

Ive also attached the azure fucntions logs
[query_data.csv](https://github.com/Azure/APICenter-Analyzer/files/14865097/query_data.csv)
log