feat: plugin APIs to get camera viewport and layers in the viewport

[issmail-basel]

Overview

Extend public API to include layers filtering by viewport

What I've done

• Use camera.computeViewRectangle() to retrieve the viewport's rectangle.
• Loop through layers and use Rectangle.contains to check if layer is inside this rectangle or not.

How I tested

reearth.layers.getLayersInViewport() in console.

[netlify]

✔️ Deploy Preview for reearth-web ready!

🔨 Explore the source changes: aaaeb70

🔍 Inspect the deploy log: https://app.netlify.com/sites/reearth-web/deploys/6203943c1ce8160008a1a699

😎 Browse the preview: https://deploy-preview-165--reearth-web.netlify.app

[codecov]

Codecov Report

Merging #165 (aaaeb70) into main (4fdf5f9) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
- Coverage   45.21%   45.14%   -0.07%     
==========================================
  Files          60       60              
  Lines        1307     1309       +2     
  Branches      212      212              
==========================================
  Hits          591      591              
- Misses        657      659       +2     
  Partials       59       59              

Impacted Files	Coverage Δ
src/components/molecules/Visualizer/Plugin/api.ts	0.00% <0.00%> (ø)
...components/molecules/Visualizer/Plugin/context.tsx	6.66% <ø> (ø)

[issmail-basel]

@rot1024 , I need your advice on the following: (I'll remind you on Monday)

• How this API should look?
• Do I loop through all layers, or make this function accept layer id/ids as a parameter?
• Architecture advice of what to consider when extending the API, and where to place the code.

After answering these, I'll write a development outline and continue with this task.
Thanks.

[rot1024]

I tested on Netlify preview and roughly ok, but I found that rect fields are radians, and also the plugin APIs often uses getters, so fix them and make sure to return the value directly instead of returning a function.