weaken FromCBOR for TxOut to Annotator TxOut

[goolord]

required for #2560

babbage's TxOut will only be an instance of FromCBOR (Annotator TxOut), so this pr adds instances for FromCBOR (Annotator.. as it bubbles up from TxOut and FromCBOR constraints where necessary in code that's reused in babbage

[lehins]

I highly recommend avoiding all the copy pasting. Most of the code added in this PR can be avoided. For example:

instance ... => FromCBOR (Annotator (EpochState era)) where
  fromCBOR = do
    es@EpochState {eslState} <- fromCBOR
    pure $ Annotator $ \fbs -> es {esLState = runAnnotator esLState fbs}

It is especially dangerous to copy serialization/deserialziation code like that, because it s possible that someone in the future will change one fromCBOR, but not the other other one.

Also it is very bad practice to copy paste code in general, it is almost always better to create an abstraction. A professor of mine said once: "If you are finding yourself copying a piece of code, it is most likely that you are doing something wrong."

So please, keep your code as DRY as possible.

[goolord]

I don't think the code in your example would typecheck. since the constraints are different the instances have to be duplicated, or we can remove the non-Annotator FromCBOR instances, but not both

[goolord]

actually, I just realized that if Ann and ApplyAnn are generalized to any Applicative, all of these instances can share the same decoding function, so i'm going to do that ☃️

[JaredCorduan]

Adding those annotators do tend to infect a lot of code, thanks for plowing through this! LGTM

[lehins]

This looks great. @goolord thank you for reducing duplication!

There are just a couple of minor suggestions that I have in this review.