Swagger Documentation

[alvin-reyes]

Is your feature request related to a problem? Please describe.
We need to be build a better experience for developers by providing documentations that can be used to programmatically integrate delta.

Describe the solution you'd like
We can use swagger and start documenting the REST API handlers.

We have done this on Estuary and we can apply the same process for Delta.

### Tasks
- [ ] Generate swagger docs for deal api
- [ ] Generate swagger docs for open stats api
- [ ] Generate swagger docs for open stats info api
- [ ] Generate swagger docs for repair and retry api

[alvin-reyes]

Scaffolding/Initial commit: https://github.com/application-research/delta/tree/swagger-docs

To run the swagger generator

make generate-swagger

The above command will do the following:

• scan the ./api directory for all the *.go files starting with router.go
• scan all the annotations on the handlers
• generate the swagger documentation in ./docs/swagger/swagger.yaml

Check swagger docs using /swagger endpoint.

• To check the generate swagger doc (json), go to http://localhost:1414/swagger/doc.json
• To check the swagger ui, go to http://localhost:1414/swagger/index.html

[dawnkelly09]

First attempt at annotations for the deal.go API file Swagger docs #143

Will need review, I have some active TODO items that I need to clarify. Requested code review with Alvin for next week when I get back from ETH Waterloo.