Improvements and fixes for consensus types #5

[dr-orlovsky]

This is the final large PR completing BP consensus implementation - most of it are the data types moved from BP std crate.

[codecov]

Codecov Report

Attention: 300 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
consensus/src/block.rs	33.3% <ø> (+13.3%)	⬆️
consensus/src/coding.rs	83.9% <100.0%> (+1.7%)	⬆️
consensus/src/stl.rs	96.8% <100.0%> (+0.6%)	⬆️
consensus/src/tx.rs	57.0% <100.0%> (+2.1%)	⬆️
consensus/src/script.rs	43.0% <82.8%> (+25.1%)	⬆️
consensus/src/segwit.rs	12.0% <12.5%> (+0.9%)	⬆️
consensus/src/taproot.rs	39.4% <30.0%> (+5.2%)	⬆️
consensus/src/hashtypes.rs	6.9% <6.9%> (ø)
consensus/src/pubkeys.rs	24.8% <24.8%> (ø)
consensus/src/timelocks.rs	9.7% <9.7%> (ø)

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