feat: export plugin install and uninstall param type from aa accounts package

[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)
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PR-Codex overview

This PR adds type exports for InstallPluginParams and UninstallPluginParams in decorator.ts.

Detailed summary

• Added type export for InstallPluginParams
• Added type export for UninstallPluginParams

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