web: lazy load parts of interfaces

[BeryJu]

instead of building a single big chunk with some vendor chunks, build smaller chunks per page-ish and load dynammically
applies for

• admin interface
• user interface
• flow interface
• locales

[codecov]

Codecov Report

Merging #2864 (6df6772) into master (4da350e) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2864      +/-   ##
==========================================
+ Coverage   91.87%   91.88%   +0.01%     
==========================================
  Files         459      459              
  Lines       20246    20246              
==========================================
+ Hits        18600    18601       +1     
+ Misses       1646     1645       -1     

Impacted Files	Coverage Δ
authentik/policies/api/policies.py	86.60% <0.00%> (-2.06%)	⬇️
authentik/outposts/controllers/docker.py	84.50% <0.00%> (+1.61%)	⬆️

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