Add taproot psbt fields

[sourcery-ai[bot]]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 1.94%.

Quality metrics	Before	After	Change
Complexity	3.17 ⭐	4.15 ⭐	0.98 👎
Method Length	85.84 🙂	83.17 🙂	-2.67 👍
Working memory	8.38 🙂	9.91 😞	1.53 👎
Quality	68.82% 🙂	66.88% 🙂	-1.94% 👎

Other metrics	Before	After	Change
Lines	1419	1758	339

Changed files	Quality Before	Quality After	Quality Change
btclib/psbt/psbt_in.py	56.77% 🙂	48.59% 😞	-8.18% 👎
btclib/psbt/psbt_out.py	75.68% ⭐	64.78% 🙂	-10.90% 👎
btclib/psbt/psbt_utils.py	81.82% ⭐	84.01% ⭐	2.19% 👍
btclib/script/taproot.py	64.83% 🙂	65.78% 🙂	0.95% 👍
tests/psbt/test_psbt.py	71.98% 🙂	71.55% 🙂	-0.43% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
btclib/psbt/psbt_in.py	PsbtIn.parse	22 😞	394 ⛔	45 ⛔	15.54% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
btclib/psbt/psbt_in.py	PsbtIn.serialize	28 😞	367 ⛔	7 🙂	35.32% 😞	Refactor to reduce nesting. Try splitting into smaller methods
btclib/psbt/psbt_in.py	PsbtIn.__init__	1 ⭐	217 ⛔	26 ⛔	41.44% 😞	Try splitting into smaller methods. Extract out complex expressions
btclib/psbt/psbt_out.py	PsbtOut.parse	9 🙂	150 😞	19 ⛔	42.52% 😞	Try splitting into smaller methods. Extract out complex expressions
btclib/script/taproot.py	check_output_pubkey	8 ⭐	212 ⛔	11 😞	47.79% 😞	Try splitting into smaller methods. Extract out complex expressions

Legend and Explanation

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• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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