docs: add flashblocks support doc

[andysim3d]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR focuses on updating documentation related to the use of Flashblocks for transaction pre-confirmation in the wallets infrastructure, enhancing user experience with faster transaction visibility and providing integration guidelines.

Detailed summary

• Updated docs/docs.yml to include a new page on using Flashblocks for pre-confirmation.
• Added detailed descriptions and integration instructions for Flashblocks in docs/pages/transactions/use-flashblocks.mdx.
• Provided examples for integrating Flashblocks with Wallet SDK, JsonRPC, and React.
• Introduced new statuses for UserOperation in the Wallet API.

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