feat(functions): use isolated-function (#591) #242

Job	Run time
contributors	33s
matrix	7s
test (@browserless/benchmark)	35s
test (browserless)	1m 27s
test (@browserless/cli)	34s
test (@browserless/devices)	39s
test (@browserless/errors)	38s
test (@browserless/function)	1m 20s
test (@browserless/goto)	1m 38s
test (@browserless/lighthouse)	1m 13s
test (@browserless/pdf)	33s
test (@browserless/screencast)	39s
test (@browserless/screenshot)	49s
test (@browserless/test)	34s
finish	2s
	11m 21s

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