Nutshell cleanup wishlist #74

Job	Run time
checks / mypy	40s
checks / formatting	21s
checks / ruff	5s
regtest (3.10, 1.7.1, CoreLightningRestWallet) / regtest	3m 2s
regtest (3.10, 1.7.1, LNbitsWallet) / regtest	2m 49s
regtest (3.10, 1.7.1, LndRestWallet) / regtest	2m 44s
tests (ubuntu-latest, 3.10, 1.7.1, FakeWallet) / poetry	1m 38s
tests (ubuntu-latest, 3.9, 1.7.1, FakeWallet) / poetry	1m 37s
	12m 56s

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