API Spec convertion script

[odra]

As a developer, I want a script that generates an open-api spec 2.0 file (aka swagger 2) from a open-api spec 3.0 file

Acceptance Criteria

• A script that takes a open-api spec 3.0 file as input and writes a swagger 2.0 file as output
• Should generate both json (app usage) and yaml (human readable) formats

Definition of Done

A swagger spec file being generated from a open-api spec 3.0 file.

Extra Notes

• This needs to be done because bravado, the open-api library we use in fasjson-client, do not support open-api spec 3.0
• This tool can be used to convert it to a swagger 2.0 file format: https://github.com/LucyBot-Inc/api-spec-converter
• swagger 2.0 does not support links so those need to be removed