[AsyncFunctionHandler] Add exception handling #299

Job	Run time
binary (humble, testing) / humble testing	3m 59s
binary (iron, main) / iron main	4m 10s
binary (humble, main) / humble main	4m 2s
binary (iron, testing) / iron testing	3m 56s
binary (jazzy, main) / jazzy main	4m 5s
binary (jazzy, testing) / jazzy testing	4m 16s
binary (rolling, main) / rolling main	4m 1s
binary (rolling, testing) / rolling testing	4m 15s
	32m 44s

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