token 2022: add metadata pointer extension to js @solana/spl-token client #3949

Job	Run time
cargo-build-test-cli	27m 4s
cargo-test-sbf	13m 53s
cargo-test-sbf-associated-token-account	9m 54s
cargo-test-sbf-transfer-hook	8m 30s
cargo-test-sbf-twoxtx	13m 58s
cargo-test-token-2022-serde	5m 7s
cargo-build-test-transfer-hook-cli	20m 6s
js-test	4m 34s
	1h 43m 6s

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