types: fix module and typescript compatibility and add missing crawler definition

[kevinmarrec]

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

• Configuration needs to be an interface to be extended by modules types and be compatible with old/current modules.
• NuxtOptions should now be extended by new modules instead of Configuration
  • It is extending Configuration to support modules still using it
  • NuxtConfig is the right import to do over Configuration in configuration files, and it inherits Configuration through NuxtOptions.
• Add missing crawler config (fixes Missed crawler field definition in NuxtOptionsGenerate #7585)
• Do not use export * as of issues with typescript < 3.9

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.

[kevinmarrec]

@pi0 I'm unsure, the issue is that :

• It's deprecated cause we want user to use NuxtConfig over Configuration
• It's also not deprecated cause modules extend it (ex: https://github.com/nuxt-community/axios-module/blob/dev/types/index.d.ts#L71)

[codecov-commenter]

Codecov Report

Merging #7590 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #7590   +/-   ##
=======================================
  Coverage   70.26%   70.26%           
=======================================
  Files          88       88           
  Lines        3747     3747           
  Branches     1020     1020           
=======================================
  Hits         2633     2633           
  Misses        905      905           
  Partials      209      209           

Flag	Coverage Δ
#unittests	70.26% <ø> (ø)

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[pi0]

It's also not deprecated cause modules extend it

Indeed. For me deprecated means something was possible, it is currently still possible but is not encouraged and will not be possible in future versions :D