Add Ledger Objects

[LimpidCrypto]

High Level Overview of Change

This PR adds (some) Ledger Object models:

• AccountRoot
• Amendment
• AMM
• Bridge
• Check
• DepositPreauth
• DID
• DirectoryNode
• Escrow
• FeeSettings
• LedgerHashes
• LedgerObject
• NegativeUNL
• NFTokenOffer
• NFTokenPage
• Offer
• PayChannel
• RippleState
• SignerList
• Ticket
• XChainOwnedClaimID
• XChainOwnedCreateAccountClaimID

You might want to look over the fields if they are still correct as it's been a while since I wrote them.

TODO

• [x] move MD... models to metadata PR (see #664)

  Context of Change

@JST5000 and I had a great chat this week. He told me one thing you might prioritize as a coming feature would be response models. I remembered I once had a PR adding Ledger Object and Metadata models and was told to split it up into two PRs, but somehow I forgot about it. This PR adds the Ledger objects. I could imagine there are some objects missing or are a bit deprecated but I still wanted to leave the progress made here for you to use.

Type of Change

• [x] New feature (non-breaking change which adds functionality)

Did you update CHANGELOG.md?

• [ ] TODO: Yes

Test Plan

I wrote tests trying to de-/serialize them from/to json.

[khancode]

One potential issue: the ledger_entry request file also contains a bunch of classes with the same names as these objects.

I don't think it's an issue since they're differentiated by import paths.

[mvadari]

One potential issue: the ledger_entry request file also contains a bunch of classes with the same names as these objects.

I don't think it's an issue since they're differentiated by import paths.

They are, but if you're using both it can still get confusing.

[khancode]

One potential issue: the ledger_entry request file also contains a bunch of classes with the same names as these objects.

I don't think it's an issue since they're differentiated by import paths.

They are, but if you're using both it can still get confusing.

Thoughts on adding prefix/postfix to the ledger object class names?

[mvadari]

@khancode this PR should also add support for the fixPreviousTxnID amendment, which was added in rippled 2.2.0.

https://github.com/XRPLF/rippled/pull/4751

[khancode]

@khancode this PR should also add support for the fixPreviousTxnID amendment, which was added in rippled 2.2.0.

https://github.com/XRPLF/rippled/pull/4751

Update: this PR is deprioritized and I'm no longer working on it. Feel free to pick it up or anyone else.