[Feature] Add support for loading secrets from env and k8s secret

[YourTechBud]

The problem faced currently?

Currently all secret data is inserted directly in each CR. That's a security risk. We need to want the ability to load secrets from env or k8s secret objects

How can we solve it?

• We have a struct named SecretSource. We should have each Source implement a method like RetrieveSecrets which returns a list of SecretSources present in that source.
• The source manager can load the secret value from the secretSource and store the value within this struct itself.
• will need to add a new field called value in this struct.
• the sources can be rest assured that they will always fine the secret value in the struct when they are getting provisioned

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