Add Siemens 2D MB PCASL example #1115

Job	Run time
build (ubuntu-latest, master)	1m 52s
build (ubuntu-latest, master)	1m 52s
build (ubuntu-latest, master)	1m 52s
build (ubuntu-latest, stable)	1m 26s
build (ubuntu-latest, stable)	1m 26s
build (ubuntu-latest, stable)	1m 26s
build (ubuntu-latest, master-deno)	1m 17s
build (ubuntu-latest, master-deno)	1m 20s
build (ubuntu-latest, master-deno)	1m 24s
build (macos-latest, master)	2m 3s
build (macos-latest, master)	2m 3s
build (macos-latest, master)	2m 3s
build (macos-latest, stable)	1m 22s
build (macos-latest, stable)	1m 22s
build (macos-latest, stable)	1m 22s
build (macos-latest, master-deno)	1m 31s
build (macos-latest, master-deno)	1m 28s
build (macos-latest, master-deno)	1m 28s
build (windows-latest, master)	7m 7s
build (windows-latest, master)	7m 7s
build (windows-latest, master)	7m 7s
build (windows-latest, stable)	6m 34s
build (windows-latest, stable)	6m 34s
build (windows-latest, stable)	6m 34s
build (windows-latest, master-deno)	2m 17s
build (windows-latest, master-deno)	1m 55s
build (windows-latest, master-deno)	2m 12s
	1h 16m 4s

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