Add Key deprecation policy.

[MohamedSalah9972]

No description provided.

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[beejones]

This policy already exist. See governance/policies/key-rotation-policy.json

[beejones]

We have not yet integrated the key rotation in the endpoints.

[beejones]

this should be calculated because the rotation policy can be changed after the creation of the key

[beejones]

creation date already exists:
jwk.timestamp = Date.now();