Add configurable popups on markers

[PartyNell]

Description

This PR adds configurable popups on map markers.

Hover behavior remains unchanged - the object's name is still displayed on hover:

Click behavior now opens a popup displaying additional information and a button to navigate to the object's detail page. By default, the popup shows the object's name (if the model has a name field):

Customization is available through the LABEL_PER_MODEL setting. This allows you to configure which fields are displayed in the popup for each model (see documentation for setup details).

⚠️ Note: LABEL_PER_MODEL is a setting for applications using MapEntity, not a MapEntity setting itself.

Example of a customized popup:

Fields specified in LABEL_PER_MODEL that don't exist on the model or have empty values will be automatically excluded from the popup display.

Related Issue

• Carte : système d'infobulles pour pouvoir afficher les attributs des objets à proximité GeotrekCE/Geotrek-admin#4626

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.97%. Comparing base (fdb4728) to head (62c9c22).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #339      +/-   ##
==========================================
+ Coverage   90.94%   91.97%   +1.02%     
==========================================
  Files          33       33              
  Lines        2452     2479      +27     
==========================================
+ Hits         2230     2280      +50     
+ Misses        222      199      -23     

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