feat: add get_original_transaction_by_hash

[enxtur]

Description

Added a method to retrieve a pending partially signed transaction by its transaction hash from the queue. Previously, existing methods required the entire transaction payload, which was cumbersome for other users who needed to build the entire transaction for signing. Now, only the transaction hash is needed.

Benefits

This improvement simplifies the process for users who need to sign transactions, as they no longer need to reconstruct the entire transaction payload. Instead, they can simply use the transaction hash. This change aligns more closely with real-world use cases, making the signing process more practical and efficient.

Checklist

• I've read CONTRIBUTING.md
• I've used the standard signed-off commit format (or will squash just before merging)
• All applicable CI checks pass (or I promised to make them pass later)
• (optional) I've written unit tests for the code changes
• I replied to all comments after code review, marking all implemented changes with thumbs up

[mversic]

can you tell us more on how do you use PENDING_TRANSACTIONS?

[enxtur]

can you tell us more on how do you use PENDING_TRANSACTIONS?

Well, simply for fetching those encoded pending transactions, if I understand correctly.
In my personal experience, I was able to fetch pending transactions using API directly and filtered with hash. So I thought this new method will make life easier.

[mversic]

can you tell us more on how do you use PENDING_TRANSACTIONS?

Well, simply for fetching those encoded pending transactions, if I understand correctly. In my personal experience, I was able to fetch pending transactions using API directly and filtered with hash. So I thought this new method will make life easier.

ok. But what do you do with pending transactions after you fetch them? I'm just trying to understand your use-case, not related to this PR

[enxtur]

can you tell us more on how do you use PENDING_TRANSACTIONS?

Well, simply for fetching those encoded pending transactions, if I understand correctly. In my personal experience, I was able to fetch pending transactions using API directly and filtered with hash. So I thought this new method will make life easier.

ok. But what do you do with pending transactions after you fetch them? I'm just trying to understand your use-case, not related to this PR

I would like another account to sign it.