feat: support listen to the theme changed event

[kiwiwong]

Description

Support listen to the theme changed event.

Fixes #645

Changes

• ColorThemeService extends GlobalEvent
• Added onChange method to ColorThemeService

[codecov]

Codecov Report

Merging #646 (a00e79a) into main (1c776c7) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #646      +/-   ##
==========================================
+ Coverage   89.30%   89.31%   +0.01%     
==========================================
  Files         185      185              
  Lines        5593     5599       +6     
  Branches     1325     1325              
==========================================
+ Hits         4995     5001       +6     
  Misses        590      590              
  Partials        8        8              

Impacted Files	Coverage Δ
src/services/theme/colorThemeService.ts	100.00% <100.00%> (ø)

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[wewoor]

+1