Function Compute as Backend using Swagger

When I use a swagger file as `DefinitionUri` and following the documentation at https://www.alibabacloud.com/help/doc-detail/88956.htm, I get the following error:
```
TypeError: Cannot read property 'role' of undefined
at deployApigateway (/usr/lib/node_modules/@alicloud/fun/lib/deploy/deploy-by-tpl.js:386:28)
at
at process._tickDomainCallback (internal/process/next_tick.js:229:7)
```

That line of code is looking for `x-aliyun-apigateway-fc`, which is what Fun is looking for:
https://github.com/aliyun/fun/blob/fe2c8e1ed3901f494e1cab2d9cdca5e54aaeb7ad/lib/deploy/deploy-by-tpl.js#L383

Almost nothing from the documentation of how a Swagger file for API Gateway should look like works with `Fun`

Start by comparing the Swagger guidance at the linked Alibaba Cloud documentation with the deployApigateway path in lib/deploy/deploy-by-tpl.js, especially around lines 383-386. Reproduce the DefinitionUri deployment and determine which documented Swagger fields Fun handles; done means the documented Function Compute API definition deploys without the reported role error.

Written by the indexing model from the issue text.