[UPM] Package embedded structure

UPM embedded project structure for testing and play sample scenes.

Additionally, were did some refactorings and new implementations (specially for Android and WebGL )

[VSCode]

• Migrate to use the new extension "visualstudiotoolsforunity.vstuc"
• Added a default Unity editor debug configuration to .vscode/launch.json

[WebGL]

• Refactoring to a more "vanilla" Javascript approach using a Vibration singleton class
• Added IsVibrateSupported() method to main .jslib
• Added repeat parameter to VibrateWithPattern() method on main .jslib
• Added a package.json file to the root embedded Unity project, to run and test WebGL builds

[Android]

• Added a generic static C# class for AndroidBuild to get Android API level

[Unity/C#]

• Refactorings to better accomplish the scene example script VibrationExample.cs
• Added Editor unit tests in order to test MobileTimeUnit.cs class
• Refactoring on Samples/VibrationExample to consider use WebGL implementations as well

[ScriptableObject] Fallback if not pass options in inspector

• If options is not defined on VibrationComponent, create a ScriptableObject instance under the hood
• Avoid compiler errors to PC, when use Handheld Unity class, that is specific for mobile builds

[ScriptableObject] Fix json serialization error

Change JsonUtility.FromJson() method to JsonUtility.FromJsonOverwrite() when try serialize a ScriptableObject. The first one throws a exception.

[Storage] Use ScriptableObject to flexible save/load vibration config

Now, is using ScriptableObject + PlayerPrefs to read the stored JSON configuration vibration. Any derived class from Options is serialized.

[First Release] Upm package

Added new component to configure and use vibration with others packages/libraries

[OpenUPM/Github Packages] Publish packages in public registries

Published this package to public registries:

• OpenUPM: packages/com.benoitfreslon.vibration
• Github Package: mfdeveloper/com.benoitfreslon.vibration

Also, include some extra modifications:

CHANGED

• Refactoring in .github/scripts/functions.sh with extra local functions to be called from npm scripts publishing automations
• Updated README.md with installation and publishing steps from OpenUPM and Github packages remote registries