Backend/Utxo: support native segwit #2878

Job	Run time
linux-vanilla--newmono-only	7m 59s
linux-vanilla--stockdotnet6-and-newmono	5m 46s
linux-github--dotnet-and-mono	3m 47s
linux-github--dotnet-and-newmono	8m 19s
linux-vanilla--stockdotnet6-and-stockmono	6m 12s
linux-vanilla--stockdotnet6-only	4m 50s
linux-vanilla--stockmono-only	5m 18s
macOS--dotnet6-and-mono	14m 25s
macOS--dotnet6-only	5m 34s
macOS--mono-only	24m 12s
windows--dotnet6-and-legacyFramework	6m 14s
windows--dotnet6-only	6m 44s
windows--legacyFramework-only	11m 1s
conventions	1m 29s
snap_pkg	6m 29s
snap_pkg_beta	8m 39s
	2h 6m 58s

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