add requestIdleCallback support for performance

[deyihu]

fix #2179

[codecov-commenter]

Codecov Report

Attention: 69 lines in your changes are missing coverage. Please review.

Comparison is base (e54e0be) 83.78% compared to head (5e50e46) 83.51%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/core/MicroTask.js	36.76%	43 Missing ⚠️
src/geometry/GeoJSON.js	0.00%	26 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2181      +/-   ##
==========================================
- Coverage   83.78%   83.51%   -0.28%     
==========================================
  Files         169      171       +2     
  Lines       18816    18916     +100     
==========================================
+ Hits        15765    15797      +32     
- Misses       3051     3119      +68     

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