docs(guide): introduce module usage

[ST-DDT]

Fixes #1323

• Document how you can find data / how faker is modularized #1323

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• https://deploy-preview-3195.fakerjs.dev/guide/#faker-modules

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.95%. Comparing base (a03378b) to head (b7f5d6e).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3195      +/-   ##
==========================================
- Coverage   99.96%   99.95%   -0.01%     
==========================================
  Files        2796     2796              
  Lines      216704   216704              
  Branches      579      577       -2     
==========================================
- Hits       216631   216615      -16     
- Misses         73       89      +16     

see 2 files with indirect coverage changes