Implement the menu for viewer

[CodeJhF]

实现了viewer的菜单的基础功能，包括设置、关于、打开文件等等以及对应的快捷键

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.38%. Comparing base (719ba96) to head (26e95e5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2752      +/-   ##
==========================================
- Coverage   77.40%   77.38%   -0.03%     
==========================================
  Files         419      419              
  Lines       22270    22270              
  Branches     6366     6366              
==========================================
- Hits        17239    17234       -5     
  Misses       3776     3776              
- Partials     1255     1260       +5     

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