add desc field sent by cocos creator

[mippolito]

PR Details

This modification is made for work to allow cocos creator can inject dependencies into cc.Components.

Description

It add new field to __proxyGetter function with description of component property made by cocos-creator component instantiator.

Related Issue

Motivation and Context

This solve de problem of injecting properties into cocos creator Components

How Has This Been Tested

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.