add receive_from_unbroadcasted_transfer_to_blinded test

[zoedberg]

The test added in this PR shows what I consider a bug:
a wallet could (maliciously) accept a transfer sending to a blinded UTXO even if the transfer TX has not been broadcasted and then send the assets to another wallet (in the test, wlt_3) which will think the received allocation is valid and owned. The receiver will notice this allocation is not spendable only when it actually tries to spend it. I think the wallet should be able to differentiate an allocation coming from a history containing an unbroadcasted/unmined TX.

Run cargo test --test transfers receive_from_unbroadcasted_transfer_to_blinded -- --nocapture to see the issue.

To be merged once we have a fix for this.

[dr-orlovsky]

Well, the wallet doesn't accept it: you force it to accept by providing a malicious offchain resolver. Just do not use it and that's it

[zoedberg]

Please read the test code. The offchain resolver is used only by the malicious actor.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.47%. Comparing base (652630f) to head (ae69d03).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   36.42%   36.47%   +0.04%     
==========================================
  Files         279      279              
  Lines       42806    42806              
==========================================
+ Hits        15594    15612      +18     
+ Misses      27212    27194      -18     

Flag	Coverage Δ
rust	36.47% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests