Add `fs.getProjectDependencies` and `fs.getProjectDevDependencies`

[LoicPoullain]

Issue

If we ever want to have an notifier that displays a message when updates to Foal have been released, we will need access to the project dependencies.

Solution and steps

• [x] Add FileSystem.getProjectDependencies
• [x] Add FileSystem.getProjectDevDependencies

Checklist

• [x] Add/update/check docs (code comments and docs/ folder).
• [x] Add/update/check tests.
• [x] Update/check the cli generators.

[codecov-commenter]

Codecov Report

Merging #1111 (83dbd2e) into v2-10-0 (8daaf31) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           v2-10-0    #1111   +/-   ##
========================================
  Coverage    98.93%   98.93%           
========================================
  Files           86       86           
  Lines         1698     1698           
  Branches       406      406           
========================================
  Hits          1680     1680           
  Misses          18       18           

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