Pipelines as Code: Remote tasking customization

As an administrator I want to make my custom tekton hub to my users so they can use our custom task  catalog using the annotations.

NOTES:

 - Can be a configmap settings:

     - if setting is empty -> no hub

     - multiple API URL separated by newline :

        catalog-api-endpoints:  catalog1:https://endoint-url,catalog2:[https://endpoint.url|https://endpoint.url/]

     - if only one endpoints set it as default.

     - if multiple endpoint allow use to specify things like catalog1://task1 catalog2://task2