AILBlockWalker: Implement Phi handler. #453

Job	Run time
windows / Test Windows	28s
macos / Test macOS	15s
ci / Build	3m 27s
ci / Lint	52s
ci / Test (0)	4m 44s
ci / Test (1)	5m 54s
ci / Test (2)	11m 12s
ci / Test (3)	7m 28s
ci / Test (4)	5m 33s
ci / Test (5)	4m 56s
ci / Test (6)	5m 23s
ci / Test (7)	5m 1s
ci / Test (8)	6m 46s
ci / Test (9)	8m 58s
ci / Publish Unit Tests Results	1s
	1h 10m 58s

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