Support USDC Paymaster

[johnson86tw]

• USDC Paymaster Addresses
• useTxModal is a store, while usePaymaster and useUsdcPaymaster are composables.
• TxModal only imports useTxModal; useTxModal depends on and exports usePaymaster, and usePaymaster depends on and exports useUsdcPaymaster.
• Added TransactionStatus.PreparingPaymaster: when the user selects the USDC paymaster but does not have allowance, they must sign a permit signature to use the USDC paymaster. In this state, the "estimate gas" button is not shown. Only after the user signs the permit signature does the TxModal state switch to Initial, at which point the "estimate" button appears.
• When TxModal opens, we set the entrypoint address supported by the currently selected account into the blockchain store.
• Even if the account is not yet deployed, the USDC paymaster can still be used; however, the permit signature cannot be verified because the account is not deployed.
• The USDC paymaster is only available on supported chains according to the entrypoint version.
• The design of sign1271 is somewhat inelegant—only Kernel requires an extra typed data wrapper. All other contracts can simply use the formatSignature approach.

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