feat(types): add basic types for Nuxt interface

[pi0]

Types of changes

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

Description

While we are migrating soon to @nuxt/kit that has fully typed Nuxt interface with nuxt2 backward compatibility, it would probably worth to fix a long time missing interface for Nuxt

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[pi0]

We can probably bring some more hints from https://github.com/nuxt/test-utils/blob/main/src/context.ts#L30

[codecov-commenter]

Codecov Report

Base: 66.25% // Head: 66.25% // No change to project coverage 👍

Coverage data is based on head (fb2310e) compared to base (d48efa6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x    #9772   +/-   ##
=======================================
  Coverage   66.25%   66.25%           
=======================================
  Files          93       93           
  Lines        4090     4090           
  Branches     1156     1156           
=======================================
  Hits         2710     2710           
  Misses       1115     1115           
  Partials      265      265           

Flag	Coverage Δ
unittests	66.25% <ø> (ø)

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