Upgradeability: use specific storage slot for owner functionality (#290) #944

Job	Run time
build-sway-lib	2m 45s
build-examples	2m 12s
build-forc-doc-sway-libs	35s
contributing-book (docs/contributing-book/src/code)	30s
forc-inline-tests	1m 6s
	7m 8s

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