feat: adjust the loading large document optimization in mobile platform

[LucasXu0]

Simulator.Screen.Recording.-.iPhone.14.Pro.-.2023-09-17.at.15.48.12.mp4

[LucasXu0]

closes #455

[codecov]

Codecov Report

Patch coverage: 3.70% and project coverage change: +0.30% 🎉

Comparison is base (1944ab7) 80.42% compared to head (eedf6a9) 80.72%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #474      +/-   ##
==========================================
+ Coverage   80.42%   80.72%   +0.30%     
==========================================
  Files         281      281              
  Lines       11683    11645      -38     
==========================================
+ Hits         9396     9401       +5     
+ Misses       2287     2244      -43     

Files Changed	Coverage Δ
...nt/service/selection/mobile_selection_service.dart	17.14% <0.00%> (+2.85%)	⬆️
.../src/render/selection/mobile_selection_widget.dart	100.00% <ø> (ø)
...ditor_component/service/scroll_service_widget.dart	80.26% <33.33%> (-0.51%)	⬇️

... and 2 files with indirect coverage changes

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