[TM-1271] Login endpoint

[roguenet]

https://gfw.atlassian.net/browse/TM-1271

This set of changes sets up:

• Auth service within user-service, with a Login endpoint that can check password hashes and return a JWT token that is tested to work with Laravel
• Database lib with the beginnings of the DB integration. Only the User model has been created so far, and it contains no logic; just the schema and the Active Record model integration
• Generation of Swagger docs for the endpoints defined in the service. View them at /api
• Linting and unit testing on Github Actions.

Note: I believe the github actions are failing because I haven't been able to set this project up in NX Cloud because the main branch doesn't have the project yet. Once that's merged, I'll try again. The CI lint / test / build command passes locally.

[nx-cloud]

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