HTTP-client to use separate env files

Hi!

In our project, we use monorepo concept so there are a lot of services in the same project.

And all those services available in different regions and different environments.

We couldn't find a way to use separate env files for http-client requests collections so we ended up writing all requests explicitly and have huge private env files for credentials.

It would be really useful to be able to declare which env file to use per .http file or even per request