Would be nice to be able to specify multiple content types?

Currently the `OpenApiRequestBodyAttribute` only accepts one content type string. The output of this in the openapi.json is:

```json
"consumes": [
"application/json"
],
"produces": [
"application/json"
],
```

But this attribute accepts multiple values, so the following is valid Openai syntax:

```json
"consumes": [
"application/json",
"test/html"
],
"produces": [
"application/json"
],
```

etc. There is no way to currently add these open api attributes using this plugin.