refactor(repo): rename extras folder to demos #3249

Job	Run time
contracts-prettier / prettier	27s
license / License checks	10s
build / Build IPC	12m 34s
contracts-sast / Solhint check	32s
contracts-sast / Slither check	59s
contracts-deployment-test / build	1m 26s
contracts-sast / Aderyn check	5m 3s
contracts-storage / Storage layout check	1m 26s
contracts-test / tests	3m 10s
demos / Demo: Axelar token	7s
fevm-contract-tests	0s
e2e-tests / run	24m 4s
unit-tests / run	19m 53s
docker-publish	0s
	1h 9m 51s

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