test: add P2PK support to MiniWallet

Summary:

This PR adds support for creating and spending transactions with raw pubkey (P2PK) outputs to MiniWallet

Backport of core#21945.
Only the changes to wallet.py are ported because we don't need it for feature_csv_activation.py.

Depends on D16405.

Test Plan:

ninja check-functional

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D16407