map mousemove event add time Threshold for performance

[deyihu]

fix #2137
fix #2103

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (34cf41d) 83.65% compared to head (5e2e21a) 83.58%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/core/util/dom.js	14.28%	6 Missing ⚠️
src/map/handler/Map.GeometryEvents.js	50.00%	2 Missing ⚠️
src/map/Map.DomEvents.js	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2138      +/-   ##
==========================================
- Coverage   83.65%   83.58%   -0.07%     
==========================================
  Files         167      167              
  Lines       18579    18590      +11     
==========================================
- Hits        15542    15539       -3     
- Misses       3037     3051      +14     

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