Feature: Add Operation for CIDR Calculations about config-lint HOT 5 CLOSED

I'm happy to review a PR. I'd expect it to include the code, a unit test, and updates to the documentation. An example like the above should be sufficient.
But I would recommend using the 'every' facility for the example since you are dealing with a list of cidr_blocks. Something like this:

   assertions:
       - every:
             key: "ingress[].cidr_blocks[]"
             expressions:
                 - key: "@"
                    op: is-subnet
                    value: "10.0.0.0/8"

Is also looks like I no longer have write privileges on the repo @jeffb4
If you add me back, I can approve the PR. Otherwise I'll just review it and let you merge it.

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Thanks @lhitchon , that is helpful guidance. I will follow up with a PR sometime next week most likely.

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@rmorris1218 - Let me know if you end up not having time. I'm on a bit of a break at the moment, and I'd find that an interesting thing to work on. But I'm assuming you'd prefer to implement it yourself ;-)

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@lhitchon take a look at the changes i made.. let me know if it is too cumbersome to have the is-private-ip operator, i just thought it was a good way of doing things

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also added a commit to account for that cannot be parsed into an IP object

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