Use react-popper for tooltips in DotplotView

[cmdcolin]

This updates the dotplot view tooltips to use react-popper instead of an absolute-positioned div with text

The absolute-positioned div can run into text-formatting issues near the margins, but the popper tries to lay out the text more nicely

Comparison

after

before

[codecov]

Codecov Report

Merging #3675 (1bb386d) into main (f75837d) will decrease coverage by 0.01%.
The diff coverage is 32.00%.

@@            Coverage Diff             @@
##             main    #3675      +/-   ##
==========================================
- Coverage   62.64%   62.63%   -0.01%     
==========================================
  Files         892      892              
  Lines       30235    30252      +17     
  Branches     7319     7321       +2     
==========================================
+ Hits        18940    18948       +8     
- Misses      11112    11121       +9     
  Partials      183      183              

Impacted Files	Coverage Δ
...view/src/DotplotView/components/DotplotTooltip.tsx	38.63% <29.16%> (-4.23%)	⬇️
...ot-view/src/DotplotView/components/DotplotView.tsx	50.75% <100.00%> (+0.37%)	⬆️

... and 2 files with indirect coverage changes

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