Add Support for NAP Precompiled Publication

[edarzins]

WIP: Add Agent support for pre-compiled NAP content published via an external source.

Proposed changes

Support the publication of NGINX App Protect (NAP) pre-compiled content (policies and log profiles) from an external source. This is configurable via nginx-agent.conf:

nginx_app_protect: precompiled_publication: true/false

true = Policies and Log Profiles are compiled and published from an external source (tgz files)
false = Policies and Log Profiles are compiled locally (json files)

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)

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[inoumbaf5]

@edarzins @oliveromahony @mtbChef please we would like the attribute name to be nms_precompiled_publish or precompiled_nms_publish

[oliveromahony]

Can you run a make deps on your branch?

[dhurley]

There is just one extra change that needs to be made for to this PR. The contents of the file src/extensions/nginx-app-protect/nap/nap_content.go should be moved the agent sdk. Seeing as its a holiday in the US today, we will make an exception and merge this PR as it is and I will create a new PR afterwards to move the functionality into the sdk.