[propose] add annotate support, naming request

Currently the name of the auto created running configuration is the combine of the http-request filename with request order number. like this `api-test#1`;
Would it be better if there is an annotation like @name, or using the text after `request separator `### as the running config name.

likes this:
```
###
@name create_user
PUT {{host}}/users

...
```
or
```
### create user
PUT {{host}}/users

```

Both of these will create a running configure named create_user.

I make this propose because usually i am running multiple requests under the running tool window.
Having a specific name for each tab will make it clear to switch between them. I change them manually in the edit configuration dialog for now.