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.
We used to store it there, if it's not within our own datadir copy it
from where it would have been stored by Liana v1.
Note we don't conditionally compile this on Windows so the codepath can
be tested with a functional test.
This was racy as it was relying on the `waitfornewblock` timeout, so it
would occasionally fail in CI.
Make this test more robust by having `waitfornewblock` wait indefinitely
and submitting a block through the P2P interface to unstuck it.
