[REQ] Add a generator for the Jetbrains HTTP Client

Is your feature request related to a problem? Please describe.

There is currently not support for the Jetbrains HTTP Client in OpenApi.
With the newly released Jetbrains HTTP Client CLI, I believe this generator can be useful to quickly generate full testing landscape for project APIs, and potentially include them as part of automated CI as well.

I'd like to add it and have created a first PR here : #14477. I intend to own that generator in the future.

Current support is pretty basic. For a given OpenAPI file, the current generator creates a HTTP request for each endpoint, with variable parameters where necessary. It also supports Content-Type headers.
You can find a list of features that I want to add in the longer run over here.

For the 3.0 Petstore, you can find the generated README as well as one of the generated API Files.

Describe the solution you'd like

There is a way to generate HTTP Endpoints definition for the Jetbrains HTTP Client.

Describe alternatives you've considered

I don't think there is any at the moment? Either have IntelliJ generate them for you or use something else :)

Additional context

Start by reviewing PR #14477 and the generated Petstore files: samples/client/petstore/jetbrains/http/client/README.md and Apis/PetApi.http. Compare the current generated endpoint requests, variable parameters, and Content-Type handling with the requested JetBrains HTTP Client support. Done means the generator is integrated and its generated output covers the agreed feature scope.