fix polyline rendering artifact

[sashankaryal]

What changes are proposed in this pull request?

The default lineJoin algorithm is miter, which extends the two lines to meet at a point called the "miter point". A miterLimit parameter is used to control how far the miter point can extend before it's beveled to prevent overly long, sharp corners. Reducing miterLimit to a low value like 1 made the corners look significantly better, but they were still not completely gone. bevel, which creates a more rounded corner by adding a diagonal line between the endpoints of the connected lines, is a nice compromise between miter and round.

(link to w3 playground for lineJoin)

Before

After

How is this patch tested? If it is not, please explain why.

Visually, locally

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release
  notes for FiftyOne users.

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (2f01d9c) 15.98% compared to head (617b961) 15.98%.
Report is 11 commits behind head on release/v0.22.0.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v0.22.0    #3476      +/-   ##
===================================================
- Coverage            15.98%   15.98%   -0.01%     
===================================================
  Files                  573      573              
  Lines                71297    71298       +1     
  Branches               800      800              
===================================================
  Hits                 11400    11400              
- Misses               59897    59898       +1     

Flag	Coverage Δ
app	15.98% <0.00%> (-0.01%)	⬇️

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Files Changed	Coverage Δ
app/packages/looker/src/lookers/abstract.ts	9.54% <0.00%> (-0.02%)	⬇️

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[benjaminpkane]

LGTM! 🎨