Add dependency firewall service definition

What does this MR do and why?

Add the definition for dependency firewall service and related feature flag. The main entry point method self.firewall_check is static to make integration easy. The consumers of this service will not keep an instance of the service around, so it makes sense to expose it as a static method. In the future the implementation might create an instance of the service, but leaving that to future MRs.

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Before After

How to set up and validate locally

No setup required to run the spec files. Feature is not completed and not yet usable.

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Related to #588474 (closed)

Edited by Duo Code Review

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