Dependencies to visp_detection

[rolalaro]

• In apps, set visp_detection as optional requirement and build the associated app only if found
• In examples, fixed missing required_deps in servo-afma6

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.68%. Comparing base (e01665e) to head (66b4836).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1908      +/-   ##
==========================================
- Coverage   48.73%   48.68%   -0.06%     
==========================================
  Files         532      532              
  Lines       69293    69293              
  Branches    32403    32403              
==========================================
- Hits        33771    33733      -38     
- Misses      24965    31427    +6462     
+ Partials    10557     4133    -6424     

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