Provide a Test action for Serverless functions

Design Doc:

https://docs.google.com/document/d/1m6OYdz696vg1v8591v0Ao0_r_iqgsWjjM2UjcR_tIrM/

Problem:

Goal

As a developer, I want to be able to test my serverless function after it's been deployed.

Why is it important?

Use cases:

1. As a developer, I want to test my serverless function 

Acceptance criteria:

1. This features needs to work in ACM (Multi cluster environment when console is being run on the Hub cluster)

Dependencies (External/Internal):

Please add a spike to see if there are dependencies.

Design Artifacts:

Exploration:

Developers can use the the kn func invoke CLI to accomplish this. According to Naina, there is an API, but it's in Go.

Note: