fix(types): add missing isFetching and nbFetching to NuxtApp interface

[mathieutu]

Types of changes

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

Description

Everything is in the title!

Thanks.

[codecov-io]

Codecov Report

Merging #8349 (ac64b7c) into dev (57aa7cc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #8349   +/-   ##
=======================================
  Coverage   68.55%   68.55%           
=======================================
  Files          91       91           
  Lines        3876     3876           
  Branches     1056     1056           
=======================================
  Hits         2657     2657           
  Misses        991      991           
  Partials      228      228           

Flag	Coverage Δ
unittests	68.55% <ø> (ø)

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[pi0]

Thanks!