MAUI: first steps #4163

Job	Run time
macOS--dotnet6-only	6m 39s
windows--dotnet6-and-legacyFramework	2m 10s
linux-github--dotnet-and-newmono	9m 23s
linux-github--dotnet-and-mono	28s
linux-vanilla--stockmono-only	6m 1s
macOS--dotnet8-and-mono	23m 42s
windows--dotnet6-only	1m 42s
windows--legacyFramework-only	9m 32s
linux-vanilla--newmono-only	9m 20s
linux-vanilla--stockdotnet6-and-newmono	2m 12s
linux-vanilla--stockdotnet6-and-stockmono	1m 4s
linux-vanilla--stockdotnet6-only	48s
macOS--mono-only	32m 51s
conventions	0s
snap_pkg	0s
snap_alpha	0s
snap_pkg_beta	0s
	1h 45m 52s

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