Store variables as Kubernetes Secrets

[zzzming]

This PR introduces an alternate backend to store variable in kubernetes secrets.
It addresses these two feature requests
#2151
#2150

@ogabrielluiz
This implementation stores both Credential and Generic variables in Kubernetes secrets when setting_service.variable_store = "kubernetes"

Or the second option is to only store the variable type is Credential to Kubernetes secrets while the rest Generic still are stored in db. For that we can introduce a flag setting_service.credential_store

Let me know which one is more appropriate.

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[ogabrielluiz]

This PR introduces an alternate backend to store variable in kubernetes secrets. It addresses these two feature requests #2151 #2150

@ogabrielluiz This implementation stores both Credential and Generic variables in Kubernetes secrets when setting_service.variable_store = "kubernetes"

Or the second option is to only store the variable type is Credential to Kubernetes secrets while the rest Generic still are stored in db. For that we can introduce a flag setting_service.credential_store

Let me know which one is more appropriate.

I think have different stores is ideal but I think it would add complexity.

Let's keep it as variable_store for now.

Thanks for this PR, ming. Looks really useful.