add typescript declare for nuxt Context

[s00d]

need to use in nuxt pluginx
example:

import type { Plugin } from '@nuxt/types';

const NuxtPlugin: Plugin = (context) => {
  context.$toast('toast enabled');
}

Description

Related Issue

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.