[FEATURE REQUEST] Convert request description from OpenAPI schema into Insomnia's request documentation

Problem occurs when importing data from an **openapi.json** file.
Paths may have a "description" property:

There is a description property in insomnia requests (for the documentation):

**Problem**
Insomnia's import feature doesn't use requests' description from the openapi schema.

Consequently, the documentations that I am writing in the source code aren't available in the documentation tab of insomnia's requests, which is a real downer.

**Reproduce**
Import this openapi schema:
```json
{"openapi": "3.0.2", "info": {"title": "Really light API", "version": "0.1.0"}, "paths": {"/": {"get": {"summary": "Name Of The Request Handler", "description": "Some description here", "operationId": "name_of_the_request_handler__get", "responses": {"200": {"description": "Successful Response", "content": {"application/json": {"schema": {}}}}}}}}}
```

**Desktop:**
- OS: macOS 10.15.7
- Installation Method: `.dmg`file from https://insomnia.rest/download

**C/C from the "About Insomnia" window**
- Version: Insomnia 2021.4.1
- Release date: 7/7/2021
- OS: Darwin x64 19.6.0
- Electron: 9.3.5
- Node: 12.14.1
- V8: 8.3.110.13-electron.0
- Architecture: x64
- node-libcurl: libcurl/7.73.0 OpenSSL/1.1.1k zlib/1.2.11 brotli/1.0.9 zstd/1.4.9 libidn2/2.1.1 libssh2/1.9.0 nghttp2/1.42.0

Use the supplied openapi.json reproduction and start at Insomnia's OpenAPI import feature. Trace how the operation description is mapped into an imported request, then verify that "Some description here" appears in the request's documentation tab. The work is done when imported OpenAPI operation descriptions are preserved in request documentation.

Written by the indexing model from the issue text.