Implement selection tools

[hanjinliu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.75244% with 109 lines in your changes are missing coverage. Please review.

Project coverage is 83.80%. Comparing base (1e1e4bb) to head (ce439ab).

Files	Patch %	Lines
whitecanvas/tools/_selection.py	79.90%	33 Missing and 8 partials ⚠️
whitecanvas/canvas/_base.py	73.46%	12 Missing and 1 partial ⚠️
whitecanvas/canvas/_namespaces.py	77.55%	9 Missing and 2 partials ⚠️
whitecanvas/layers/_mixin.py	40.00%	6 Missing and 3 partials ⚠️
whitecanvas/backend/matplotlib/canvas.py	46.15%	7 Missing ⚠️
whitecanvas/backend/matplotlib/bars.py	70.58%	3 Missing and 2 partials ⚠️
whitecanvas/backend/pyqtgraph/canvas.py	28.57%	5 Missing ⚠️
whitecanvas/backend/vispy/canvas.py	28.57%	5 Missing ⚠️
whitecanvas/_signal.py	86.95%	1 Missing and 2 partials ⚠️
whitecanvas/backend/plotly/canvas.py	40.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   83.73%   83.80%   +0.07%     
==========================================
  Files         164      167       +3     
  Lines       18488    18953     +465     
  Branches     3113     3184      +71     
==========================================
+ Hits        15481    15884     +403     
- Misses       2191     2233      +42     
- Partials      816      836      +20     

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