[ADP-3350] Change `currentNodeTip` to use `Read.ChainTip`

[HeinrichApfelmus]

This pull request changes the currentNodeTip function to use the data type ChainPoint to the Cardano.Wallet.Read hierarchy.

In order to make the types ChainPoint and ChainTip more convenient to use, I have also added record fields.

Comments

• The combination of NoFieldSelectors, DuplicateRecordFields, and NamedFieldPuns enables short field names such as slotNo. Specifically
  • NoFieldSelectors — enables the use of slotNo as a variable outside of a record context (very common).
  • DuplicateRecordFields — enables the use of slotNo in both ChainPoint and ChainTip.
  • NamedFieldPuns — enables pattern matching of the form BlockPoint{slotNo}.
• The goal is to eventually remove the legacy primitive types.

Issue Number

ADP-3350

[HeinrichApfelmus]

I wonder if it is still in draft state ... For me it is quite complete PR as it is;-)

Thanks! 😊 I'm just trying to weed out the last compilation errors before asking for your time again — thanks for the review, it's pretty much complete, indeed.