[understandability] make nft/ and iptables/ packages more similar

[jayunit100]

Both NFT And IPTAbles import the localsink package, of course, but the import different structs from it. To make it clear where their architecture is similar lets

• move the logic of iptables sink.go into register.go OR
• make the register.go in nft separated out into sink.go for the part that imports the "sigs.k8s.io/kpng/client/localsink/fullstate"
• make it so the different Sink implementations are easy to reason about
• Add logging to the OpItem and Send functions (these run on the backends... but they are called from the brain)

[k8s-ci-robot]

@jayunit100:
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In response to this:

Both NFT And IPTAbles import the localsink package, of course, but the import different structs from it. To make it clear where their architecture is similar lets

• move the logic of iptables sink.go into register.go OR
• make the register.go in nft separated out into sink.go for the part that imports the "sigs.k8s.io/kpng/client/localsink/fullstate"

/good-first-issue

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[jayunit100]

this is not really a good first issue :) i think ill do it

[jayunit100]

/assign

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