"fun local start" does not act like api gateway

Right now testing [Using Function Compute as API Gateway's backend service](https://www.alibabacloud.com/help/doc-detail/54788.htm#Create%20and%20define%20a%20Function%20Compute%20backend%20service%20API) **locally** is very difficult.

Could it please be made similar to testing [http triggers locally](https://github.com/aliyun/fun/blob/master/lib/commands/local/http-support.js#L40).

For example:

If I have a resource like this
```yaml
apiGroup:
Type: "Aliyun::Serverless::Api"
Properties:
StageName: RELEASE
DefinitionBody:
"/gateway-example":
get:
x-aliyun-apigateway-api-name: example
x-aliyun-apigateway-fc:
arn: acs:fc:::services/${gatewayExample.Arn}/functions/${functionExample.Arn}/
timeout: 10000
```

I would like to be able to run `fun local start`
and then curl this

```shell
curl -i --get --include 'http://localhost:8000/gateway-example' -H 'Authorization:APPCODE 你自己的AppCode'
```

Start by reading lib/commands/local/http-support.js, the existing local HTTP trigger support referenced in the issue. Run fun local start with the shown API resource, then use the provided curl request to compare the current behavior with the requested gateway-style route; done means the local endpoint responds through /gateway-example.

Written by the indexing model from the issue text.