feat(wallet): enable anti-fee sniping with randomization

[aagbotemi]

Description

This PR implements Anti-Fee-Sniping with randomization as discussed in issue bitcoindevkit/bdk_wallet#47.

Notes to the reviewers

The implementation adds randomization to anti-fee-sniping behavior:

1. Uses a 50/50 chance to choose between nLockTime and nSequence (when possible)
2. Adds a 10% chance to set either value further back in time (by a random value between 0-99)
3. Detects taproot inputs and their confirmation status

Changelog notice

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• 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

[aagbotemi]

This PR has been reopened on bitcoindevkit/bdk_wallet#207