chore: export additional types

[MoMannn]

📝 Description

Added type exports for PermissionRequestParameter and Erc7715Client to improve developer experience when working with ERC-7715 permissions API.

🔄 What Changed?

• Exported PermissionRequestParameter type - the single item type from RequestExecutionPermissionsParameters array
• Added new Erc7715Client type for typing viem clients extended with erc7715ProviderActions()

🚀 Why?

• PermissionRequestParameter: Previously only the array type RequestExecutionPermissionsParameters was exported. Developers needed access to the single item type when building individual permission objects.
• Erc7715Client: When using extend(erc7715ProviderActions()) with immediate assignment, TypeScript infers the type correctly. However, when declaring a variable before assignment (e.g., let client = null), there was no exported type to annotate it with. This enables:

  let client: Erc7715Client | null = null;
  
  function setupClient() {
    client = createWalletClient({...}).extend(erc7715ProviderActions());
  }

🧪 How to Test?

Describe how to test these changes:

• Manual testing steps:

1. Use the types

• Automated tests added/updated
• All existing tests pass

⚠️ Breaking Changes

List any breaking changes:

• No breaking changes
• Breaking changes (describe below):

📋 Checklist

Check off completed items:

• Code follows the project's coding standards
• Self-review completed
• Documentation updated (if needed)
• Tests added/updated
• Changelog updated (if needed)
• All CI checks pass

🔗 Related Issues

Link to related issues:
Closes #
Related to #

📚 Additional Notes

Any additional information, concerns, or context:

---

Note

Adds missing type exports to improve typing around ERC-7715 actions.

• Export PermissionRequestParameter from erc7715RequestExecutionPermissionsAction via src/actions/index.ts
• Introduce Erc7715Client type (a Client extended with erc7715ProviderActions) with usage docs in comments
• Update CHANGELOG.md under Unreleased to reflect the new exports

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