Return error if limit and offset are the same number

[imAsterSun]

Environment

• Version:

  cli version: 0.5.2
  core version: 0.5.2
  build version: 0.5.2
  serve version: 0.5.2
  

• OS: macOS

What's wrong?

If the limit and offset are set to the same number, it will return an error message.

What's the correct behavior?

It should be a normal respond.

Reproducing steps

1. Deploy vulcan API with pagination to a canner workspace.
2. Request the api with offset and limit are the same number, e.g. offset=10&limit=10