fix(wallet): added the validation of UTXO data for build_fee_bump

[ItshMoh]

Description

It fixes the Issue bitcoindevkit/bdk_wallet#51 . In this PR we are checking the size of the prev_tx.output list for ensuring that it contains the output referred by each input of the transaction to be bumped.

Notes to the reviewers

here prev_tx.output size is checked. Also changed the .map form .and_then for proper handling of Result.

Checklists

All Submissions:

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

Bugfixes:

• This pull request breaks the existing API
• I've added tests to reproduce the issue which are now passing
• I'm linking the issue being fixed by this PR

[ItshMoh]

Hey @ValuedMammal for This PR. Is the new error variant suitable. Or I should look for existing error variants as you have suggested with #1911 . What do you suggest?

[aagbotemi]

Hey @ItshMoh. you've done a great job working on this PR.

I will suggest you add some unit tests to cover your new implementation. This will help ensure that edge cases, such as validation UTXO data, are handled correctly. Thanks!