We introduce Taproot support in the test framework through a global
toggle. A few modifications are made to some tests to adapt them under
Taproot (notably the hardcoded fees / amounts).
This is based on my introduction of a quick and dirty support for
TapMiniscript in my python-bip380 library:
https://github.com/darosior/python-bip380/pull/23. In addition to this i
didn't want to implement a signer in the Python test suite so here we
introduce a simple Rust program based on our "hot signer" which will
sign a PSBT with an xpriv provided through its stdin and output the
signed PSBT on its stdout. Eventually it would be nicer to have a Python
signer instead of having to call a program.
The whole test suite should pass under both Taproot and P2WSH. Only a
single test is skipped for now under Taproot since it needs a finalizer
in the test suite.
I also caught a bug in the RBF tests which i fixed in place.
ecef6bff5e