[Sign Tx] Integrate with 'stellar-wallets-kit'

[jeesunikim]

Summary:

• installed @creit.tech/stellar-wallets-kit
• installed the latest tslib to ensure that all dependencies use the latest tslib helpers. Without it, I ran into the error Type error: This syntax requires an imported helper named '__spreadArray' which does not exist in 'tslib'. Consider upgrading your version of 'tslib' because @walletconnect/sign-client dependency within stellar-wallets-kit had a strict requirement for tslib@1.14.1
• raised a minor issue in Stellar-Wallets-Kit repo

https://github.com/stellar/laboratory/assets/3912060/61004d88-c6bb-4db0-b4fb-ffa8e7fb336f

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