[AsyncFunctionHandler] Add exception handling #296

Job	Run time
binary (humble, main) / humble main	4m 9s
binary (humble, testing) / humble testing	4m 7s
binary (iron, main) / iron main	4m 12s
binary (iron, testing) / iron testing	4m 15s
binary (jazzy, main) / jazzy main	4m 2s
binary (jazzy, testing) / jazzy testing	4m 9s
binary (rolling, main) / rolling main	4m 11s
binary (rolling, testing) / rolling testing	3m 59s
	33m 4s

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