feat: extend plugin API with camera control

[airslice]

Overview

This is required for reearth/reearth#337

This PR extends plugin API with:

reearth.camera.enableScreenSpaceController
reearth.camera.lookHorizontal
reearth.camera.lookVertical
reearth.camera.moveForward
reearth.camera.moveBackward
reearth.camera.moveUp
reearth.camera.moveDown
reearth.camera.moveLeft
reearth.camera.moveRight
reearth.camera.moveOverTerrain (async)
reearth.camera.flyToGround (async)

What I've done

Implement these metheds on engine and expose them to plugin API.

What I haven't done

How I tested

• Functionalities tested with plugin.

Screenshot

Which point I want you to review particularly

• The naming of enableScreenSpaceController and disableScreenSpaceController seems too long but i didn't come out with any better naming for it.
• The lookXxx and moveXxx methods also can be merged into one with another param to define the direction but it will lead to one more condition check in each call and i think it might be better to provide these metheds more directly like this. Is that okey?

Memo

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[codecov]

Codecov Report

Merging #311 (3bd66c7) into main (dcdf938) will increase coverage by 0.32%.
The diff coverage is 49.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #311      +/-   ##
==========================================
+ Coverage   16.75%   17.07%   +0.32%     
==========================================
  Files         502      502              
  Lines       48751    49273     +522     
  Branches      524      550      +26     
==========================================
+ Hits         8168     8415     +247     
- Misses      40565    40840     +275     
  Partials       18       18              

Impacted Files	Coverage Δ
src/components/molecules/Visualizer/Engine/ref.ts	0.00% <0.00%> (ø)
src/components/molecules/Visualizer/Plugin/api.ts	6.21% <0.00%> (-0.93%)	⬇️
...rc/components/molecules/Visualizer/Plugin/types.ts	0.00% <0.00%> (ø)
src/components/molecules/Visualizer/hooks.ts	0.00% <0.00%> (ø)
src/components/molecules/Visualizer/storybook.tsx	0.00% <0.00%> (ø)
...components/molecules/Visualizer/Plugin/context.tsx	30.94% <26.66%> (-0.74%)	⬇️
...molecules/Visualizer/Engine/Cesium/useEngineRef.ts	66.80% <67.53%> (+0.13%)	⬆️
...nents/molecules/Visualizer/Engine/Cesium/common.ts	41.25% <73.82%> (+10.87%)	⬆️
...les/Visualizer/Engine/Cesium/useEngineRef.test.tsx	99.73% <100.00%> (+0.06%)	⬆️