Feature/anti fee sniping

[aagbotemi]

Description

This PR implements Anti-Fee-Sniping with randomization as discussed in issue #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

Closes #47

[coveralls]

Pull Request Test Coverage Report for Build 14684778812

Details

• 191 of 240 (79.58%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 86.333%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wallet/src/wallet/tx_builder.rs	191	240	79.58%

Totals
Change from base Build 14270666930:	-0.2%
Covered Lines:	7460
Relevant Lines:	8641

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💛 - Coveralls