docs: update alchemy provider constructor doc with updated config

[denniswon]

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:fix)
• Is the base branch you're merging into development and not main?
• Did you follow the contribution guidelines?

---

PR-Codex overview

Detailed summary

• Updated the opts parameter type in the constructor method of the SmartAccountProvider class in aa-alchemy/provider/constructor.md to SmartAccountProviderOpts.
• Added a new feeOptions parameter in the constructor method of the SmartAccountProvider class in aa-alchemy/provider/constructor.md to set user operation fee options.
• Added new fields maxFeePerGas, maxPriorityFeePerGas, callGasLimit, verificationGasLimit, and preVerificationGas in the opts parameter of the constructor method of the SmartAccountProvider class in aa-alchemy/provider/constructor.md.
• Added a new note explaining the usage of custom middleware and handling fee options in aa-core/provider/constructor.md.

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}