Akash API documentation (swagger)

[anilmurty]

https://docs.akash.network/akash-nodes/api-endpoints currently only includes Cosmos SDK APIs and this isn't very helpful for anyone trying to build on or integrate with Akash.

We should enable https://github.com/akash-network/akash-api/blob/main/docs/swagger-ui/swagger.yaml and any other APIs to be viewable in swagger instead and run a hosted instance of the UI (maybe on the colo provider?)

[troian]

swagger documentation is off by default.
it can be enabled on each node by either in app.toml

[api]
enable = true
swagger = true

or with environment variables:
AKASH_API_ENABLE=true AKASH_API_SWAGGER=true.

API by default is available on port 1317