Check if parameters have gas fees first

[plusminushalf]

This PR fixes the issue where prepareUserOperation overrides the gas field that are already present in the user operation.

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PR-Codex overview

This PR focuses on updating the handling of user-defined fee parameters in the prepareUserOperation function to improve the precedence of these parameters.

Detailed summary

• Updated the precedence of user-defined fee parameters in prepareUserOperation.
• Removed redundant check for sufficient fee properties before returning the request.
• Retained the logic to estimate fees if user-defined properties are not sufficient.

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🦋 Changeset detected

Latest commit: fd8cd06

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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viem	Patch

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