Support for COUNT mode for WAF

[Kevinwochan]

Is your feature request related to a problem? Please describe.
AWS WAF prescriptive guidance recommends setting managed rules into COUNT mode to baseline activity and detect false positives

Describe the feature you'd like
CloudFormation parameters only support "yes'/"no"
An option should be added for the action as well.

[kroeter]

Thanks for the post Kevin - we have another released planned for this solution in H2 of this year and I'll consider this during our next grooming session. Let me know if you're open for further discussion of other features that you'd like to see for this solution.

[sbe-arg]

cross reference #264 where I added more details on how this can be implemented.

[bios6]

Hi, Thanks for raising this issue