A support for Spring Cloud Fuction Web

[Marx2]

Is your feature request related to a problem? Please describe.
After implementing a Java Function and adding spring-cloud-function-web dependency all such functions are exposed as REST endpoint automatically. It's described here: https://spring.io/blog/2020/12/23/cloud-events-and-spring-part-2

Describe the solution you'd like
I'd like to see all such endpoints be visible on Swagger documentation.

[bnasslahsen]

@Marx2,

The support is now added.
Don't hesitate to test it with the latest SNAPSHOT and provide your feedback.