text: Title: Setting Swagger fields in `info`
  Body: **Describe the bug**
  Swagger provides the option to define many more fields under `info` such as:
  - `termsOfService`
  - `license`
    - `license.name`
    - `license.url`
  - `contact`
    - `contact.email`
   
  There is no documented way to set these fields in the generated Swagger file.
  
  **Expected behavior**
  There should be a way to configure these fields.
  
  **Python Information (please complete the following information):**
   - Python v3.10.1
   - Spectree v0.6.8
   - Falcon v3.0.1
  