[WIP] Encryption and decryption of secrets at rest

[neeraj-orch]

This is a WIP

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All committers have signed the CLA.

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[amanda11]

@neeraj-orch If this is WIP would you mind using the option "convert to draft" - just after the reviewers. We also tend to put WIP in the title as well.
That way, we know from a glance at the list of outstanding pull requests, that its not waiting on the TSC to review.

Many thanks, and thanks for looking at enhancement to StackStorm.

[neeraj-orch]

@amanda11
Sure, I have made the said modifications. I hope it helps and let me know if I missed anything.
Thanks!