feat: add autoImpersonate flag

[banky]

Anvil allows an autoImpersonate flag. This is really useful for simulating transactions from accounts that aren't already unlocked. See the docs here: https://book.getfoundry.sh/reference/anvil/#options

This PR adds the --auto-impersonate flag

Thanks!

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PR-Codex overview

This PR adds the autoImpersonate property to AnvilOptions in createAnvil.ts for enabling auto impersonation feature.

Detailed summary

• Added autoImpersonate property to AnvilOptions
• Implemented test for starting anvil with auto impersonation
• Updated createAnvilClients to support auto impersonation functionality

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[changeset-bot]

🦋 Changeset detected

Latest commit: 5f094bc

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

This PR includes changesets to release 1 package

Name	Type
@viem/anvil	Minor

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