Optimisation: Improve image management in every module

[guillaumetavernier]

Change in this PR :

• MapNotifier types is now Map<,> rather than AsyncChild<Map<>> (unnecessary abstraction)
• AutoLoadChild now uses group given by the provider.select() clause, preventing unnecessary rebuild
• Remove loadTList from the initialization of Image MapNotifier causing images reload on every list modification
• Add Image Map management on add/edit/delete item related to the image

This PR affects :

• admin
• advert*
• amap
• cinema*
• loan
• vote*
• loan
• tombola*
• vote*

• Where most changes to image happen

[maximeroucher]

Awesome !

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 56.86275% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 55.80%. Comparing base (3791c95) to head (59446d3).

Files	Patch %	Lines
lib/tools/providers/map_provider.dart	52.77%	17 Missing ⚠️
lib/cinema/providers/session_poster_provider.dart	71.42%	2 Missing ⚠️
.../cinema/providers/session_poster_map_provider.dart	0.00%	1 Missing ⚠️
lib/vote/providers/contender_logo_provider.dart	83.33%	1 Missing ⚠️
lib/vote/providers/contender_logos_provider.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #309      +/-   ##
==========================================
- Coverage   56.03%   55.80%   -0.23%     
==========================================
  Files         161      163       +2     
  Lines        3514     3505       -9     
==========================================
- Hits         1969     1956      -13     
- Misses       1545     1549       +4     

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