feat: support entity array in flyTo on reearth/core

[keiya01]

Overview

What I've done

• I added entity array support to flyTo like flyTo([layerId or featureId]).

What I haven't done

How I tested

Screenshot

flyTo([sphereId1, sphereId2])

Screen.Recording.2023-02-15.at.15.12.10.mov

flyTo(onlyOneFeatureId)

Screen.Recording.2023-02-15.at.11.05.16.mov

Which point I want you to review particularly

Memo

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[codecov]

Codecov Report

Merging #459 (cec74e7) into main (31ba319) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   26.94%   26.93%   -0.01%     
==========================================
  Files         743      743              
  Lines       86707    86726      +19     
  Branches     1868     1868              
==========================================
  Hits        23360    23360              
- Misses      63251    63270      +19     
  Partials       96       96              

Impacted Files	Coverage Δ
src/core/Crust/Plugins/hooks.ts	0.00% <0.00%> (ø)
src/core/Crust/Plugins/plugin_types.ts	0.00% <0.00%> (ø)
src/core/Map/types/index.ts	0.00% <0.00%> (ø)
src/core/engines/Cesium/useEngineRef.ts	54.91% <0.00%> (-2.44%)	⬇️