sdk: add passkey recovery option #20722
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Description
after thinking about https://github.com/MystenLabs/passkey-example?tab=readme-ov-file#notes-on-wallet-storage i realize we should provide the recovery ability in our sdk since getPasskeyInstance is a bit unflexible and create a new credential every time when called. we should allow user to find its passkey wallet without creating a new one. similar to "log in to existing" vs "create new". but i leave the way to recover to the wallet impelementer due to the ux considerations. one requires two signings and the other requires one.
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