chore: prep user op fix

[joepegler]

resolved BIC-602

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PR-Codex overview

This PR focuses on updating the user operation handling in the @biconomy/sdk by removing the signature from the prepareUserOperation flow and introducing a new function, prepareUserOperationWithoutSignature.

Detailed summary

• Updated version in package.json from 0.0.25 to 0.0.26.
• Added prepareUserOperationWithoutSignature function in prepareUserOperationWithoutSignature.ts.
• Replaced calls to prepareUserOperation with prepareUserOperationWithoutSignature in relevant files.
• Updated debugUserOperation and prepareTokenPaymasterUserOp to use the new function.
• Modified test file to reflect changes in user operation preparation.
• Added documentation for prepareUserOperation in index.ts.

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[github-actions]

size-limit report 📦

Path	Size
core (esm)	17.14 KB (+0.23% 🔺)
core (cjs)	23.68 KB (+0.59% 🔺)
bundler (tree-shaking)	518 B (0%)
paymaster (tree-shaking)	543 B (0%)