Add centers, extra user fields and term customizer modules

[fblupi]

Fixes #2
Fixes #3
Fixes #4
Fixes #5

• Install modules
• Make centers and extra user fields work together
• System test with centers and extra user fields (register and update account)

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (0efa0bd) 9.52% compared to head (9496c52) 0.00%.

Files	Patch %	Lines
...pp/forms/concerns/decidim/account_form_override.rb	0.00%	28 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main      #6      +/-   ##
========================================
- Coverage   9.52%   0.00%   -9.53%     
========================================
  Files          8       9       +1     
  Lines         21      51      +30     
========================================
- Hits           2       0       -2     
- Misses        19      51      +32     

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