♻️ Rename LibRLP convenience functions

[Vectorized]

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Description

To prepare for https://github.com/Vectorized/solady/issues/1069.

This is breaking in internal API.

I feel p is more natural than having l, a, b, etc. if the struct name is different.

@RogerPodacter

Letting this marinate first. Not urgent.

Checklist

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• [x] Ran forge fmt?
• [x] Ran forge snapshot?
• [x] Ran forge test?

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