rthooks: support NRI

[kkourt]

This is a first PR for supporting NRI (https://github.com/containerd/nri), and having an easy way to install the tetragon runtime hook in containerd. Please see patches.

The idea here (which will be completed in a subsequent PRs) is to:

• Have a different image for the runtime hooks binaries (tetragon-rthooks)
• Create a separate daemonset for them, so that they can be independent from the tetragon daemonset)
• Use this daemonset for the NRI hook (containerd)
• Also use this daemonest for the CRI-O hook (where now we are using an init container)

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[kkourt]

I did one pass, left a few minor comments. I would need a second pass to fully follow the code logic, but looks good overall :)

Thanks Anna! I addressed the comments.

[kkourt]

Nice patches! I just skipped this commit 4360fbf to be honest but the rest looks good, here are some comments :)

Thanks for the review! Pushed a new version to address the comments.

[kkourt]

Merging this, thanks everyone for the helpful reviews!