docs: gas-override-general-faq

[caleighc]

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PR-Codex overview

This PR adds a new section to the FAQ documentation on how to send user operations without gas sponsorship, providing two approaches for users to manage gas payments.

Detailed summary

• Added a new FAQ section titled "How to Send User Operations without Gas Sponsorship?"
• Described two approaches for users to pay gas themselves:
  • Option 1: Omit gas policy in AlchemyAccountProvider configuration.
  • Option 2: Override sponsorship at the UserOp level by setting paymasterAndData to 0x.
• Included a TypeScript code snippet demonstrating the second approach.

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