Add finalize to Psbt

[andreasgriffin]

Description

Add finalize() to Psbt. See https://github.com/bitcoindevkit/bdk-ffi/issues/469

Checklists

All Submissions:

• [x] I've signed all my commits
• [x] I followed the contribution guidelines
• [x] I ran cargo fmt and cargo clippy before committing

New Features:

• [ ] I've added tests for the new feature
• [ ] I've added docs for the new feature

[andreasgriffin]

@thunderbiscuit : Do you know how to solve the electrum-client errors in the CI-tests?

[thunderbiscuit]

A rebase of this on master should solve your issues! We're finally ready to start merging new stuff. Feel free to rebase and I'll take a look today/tomorrow.

[andreasgriffin]

@thunderbiscuit : Could you take a look if it is ready to be merged?

[rustaceanrob]

You'll want to squash this into a single commit by using git rebase -i HEAD~5 and changing pick to squash. You will also want to rename your commit message using conventional commits. Although, I am afraid this work may also be in vein as adding PSBT to bitcoin-ffi is planned here. If I pick up PSBT as a type to add I will be sure to include finalize

[andreasgriffin]

If I pick up PSBT as a type to add I will be sure to include finalize

Great!

[rustaceanrob]

#630 closes this. Thanks @andreasgriffin