Mint: add websockets for quote updates #627

Job	Run time
checks / mypy	53s
checks / ruff	7s
checks / format	25s
regtest (3.10, 1.7.1, CoreLightningRestWallet, ./test_data/test_mint) / regtest	4m 51s
regtest (3.10, 1.7.1, LNbitsWallet, ./test_data/test_mint) / regtest	4m 29s
regtest (3.10, 1.7.1, LndRestWallet, ./test_data/test_mint) / regtest	4m 36s
tests (ubuntu-latest, 3.10, 1.7.1, false, postgres://cashu:cashu@localhost:5432/cashu, FakeWallet) / Run (db postgres://cashu:cashu@localhost:5432/cashu, deprecated api false)	2m 19s
tests (ubuntu-latest, 3.10, 1.7.1, true, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api true)	2m 37s
tests (ubuntu-latest, 3.10, 1.7.1, true, postgres://cashu:cashu@localhost:5432/cashu, FakeWallet) / Run (db postgres://cashu:cashu@localhost:5432/cashu, deprecated api true)	2m 43s
tests (ubuntu-latest, 3.10, 1.7.1, false, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api false)	2m 18s
	25m 18s

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