Add Silent Payments Support

[macgyver13]

Finally consider this PR ready for review and feedback to determine next steps.

TODOs:

• verify silent payments labeled address handling
• verify multi sig silent payment workflows
• address edge cases / attack scenarios
• (on hold) test on real hardware - evaluate memory and performance
• (partial) proper UI/UX for Silent Payments - seeking feedback

Screenshots

Updated UX with - silent payment address - appended to - to address -

Contribute Shares Prompt

[macgyver13]

Still have plenty of tasks to do on this PR but wanted to provide a checkpoint given the number of changes. I can break this into multiple PRs if preferred. I expect commits 7887701 through c516610 to remain stable.

Core Changes:

• fix: (psbt v2)
• fix: (usb_test)

Silent Payments Changes:

• Standardized testing to use pytest and simulator instead of ngu_wrapper
• Added bip375_test_vectors.json and parameterized test_silentpayments to use each vector
• Introduced the workflow of contributing shares but not signing when multi-signers contribute to a SP output
• Silent Payments Address is now appended to UI text instead of replacing - to address -
• Labeled silent payments addresses are rendered correctly for change
• Added BIP376 fields and associated operations

TODOs:

• Considering how to show BIP353 HRN when provided by wallet coordinator like Sparrow
• Identify sensitive material areas that need to be cleared
• Add more tests to handle edge cases - open to suggestions
• Consider doc/silentpayments.md

[macgyver13]

Summary of changes since March update:

• Added bip352_test_vectors.json and test_bip352_vectors.py
• Added BIP376 spend path validation
• Clear sensitive material in Silent Payments workflows
• Added doc/silentpayments.md
• Added bip352 generic format export
• Total integration tests in test_silentpayments.py:
  • test_sp_signing_story
  • test_sp_p2wpkh_input
  • test_sp_p2tr_input
  • test_sp_mixed_inputs
  • test_sp_mixed_sp_spend_and_regular_input
  • test_sp_three_outputs_same_scan_key
  • test_sp_two_outputs_different_scan_keys
  • test_sp_mixed_output_types
  • test_sp_all_owned_multi_input
  • test_sp_partial_owned_coverage_complete
  • test_sp_partial_owned_coverage_incomplete
  • test_sp_partial_owned_coverage_incomplete_refused
  • test_sp_spend_silent_payment_output
  • test_sp_spend_silent_payment_output_with_taproot
  • test_sp_spend_wrong_tweak_rejected
  • test_sp_spend_wrong_purpose_rejected
  • test_sp_spend_wrong_coin_type_rejected
  • test_exit_gracefully_on_sp_validation_failure
  • test_sp_non_sighash_all_rejected
  • test_sp_psbt_v0_rejected
  • test_sp_spend_to_labeled_change_address

Testing

Targeted tests

cd testing
pytest test_bip352_vectors.py
pytest test_bip375_vectors.py
pytest test_silentpayments.py
pytest test_export.py::test_export_coldcard

General tests

DEFAULT_PYTEST_MARKS = "not onetime and not veryslow and not manual and not bitcoind"
python run_sim_tests.py --multiproc --num-proc 6