commands: add `rbfpsbt` command #1534

Job	Run time
linter_gui	5m 42s
linter	38s
unit_tests (1.54, ubuntu-latest)	5m 11s
unit_tests (1.54, macOS-latest)	10m 36s
unit_tests (1.54, windows-latest)	6m 44s
unit_tests (nightly, ubuntu-latest)	58s
unit_tests (nightly, macOS-latest)	1m 16s
unit_tests (nightly, windows-latest)	1m 52s
unit_tests_gui (1.65, ubuntu-latest)	6m 43s
unit_tests_gui (1.65, macOS-latest)	12m 26s
unit_tests_gui (1.65, windows-latest)	8m 55s
unit_tests_gui (nightly, ubuntu-latest)	2m 39s
unit_tests_gui (nightly, macOS-latest)	3m 46s
unit_tests_gui (nightly, windows-latest)	3m 59s
	1h 11m 25s

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