Added documents for migration to URP/HDRP, and fixed the incorrect depth pixel values in Depth Camera

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-name: Unity 2022.3.x Test Runner
+name: CI check for Unity 2020.3.x, 2021.3.x, 2022.3.x
 
 on:
   pull_request:
@@ -15,6 +15,8 @@ jobs:
       fail-fast: false
       matrix:
         unityVersion:
+          - 2020.3.48f1
+          - 2021.3.42f1
           - 2022.3.42f1
 
     steps:

Assets/Resources/ROSConnectionPrefab.prefab

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Assets/UnitySensors/Editor/UnitySensorsEditor.asmdef

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Assets/UnitySensors/Runtime/Prefabs/Camera/DepthCamera.prefab

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