Implement "integration" routes in the non-saas server

[MMJM]

@tasn Discussion converted to issue ticket here.

Discussed in #1248

^{Originally posted by MMJM March 5, 2024}
I have got the Docker image of Svix running locally.

I am able to Login fine and create an application like this:
svix application create '{\"name\": \"TestApp\"}'

When I grab the app ID and try to create an Integration like this:
svix integration create 'app_2dFSt8fO4lLXSoZ1usITKEpkFhg' '{\"name\": \"TestIntegration\"}'

All I get is an Error: 404 Not Found error

I have tried this on the SAAS service and it works fine.

I can list the applications and it certainly exists

What is going on to throw this error?

Thanks

[tasn]

Thanks for creating the ticket!