pinocchio: Add `pubkey_eq` helper #1220

Job	Run time
Process Workspace	1m 32s
Spellcheck	48s
Check (programs/associated-token-account)	45s
Check (programs/memo)	52s
Check (programs/system)	54s
Check (programs/token)	52s
Check (programs/token-2022)	1m 4s
Check (sdk/log/macro)	54s
Check (sdk/pinocchio)	55s
Check (sdk/log/crate)	59s
Check (sdk/pubkey)	1m 6s
	10m 41s

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