Use the pkg/cache in Source-Controller

[souleb]

A cache package has been developed to cache objects with an objective to provide a better performance and reduce stress on cloud providers APIs.

The following list the tasks to be done in Source-Controller in order to achieve the aforementioned objective:

• cache contextual-login credentials for OCI artifacts; Enable caching contextual Login Credentials #1521
• Replace the cache used for Helm indexes
• The clients used in pkg/azure|gcp|minio should be reused, they are thread safe and can handle token refresh