Create sandbox attribute for aui:script tag

• Type: Technical Task
• Status: Closed
• Resolution: Fixed
• Affects Version/s: None
• Fix Version/s: 7.0.0 M2
• Component/s: ~ [Archived] Frontend Infrastructure
• Labels: None
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/21567

The purpose for the sandbox attribute is to wrap the contents of the script tag in a self-invoking function, and to enable shorthanding the $ and _ variables rather than calling AUI.$ and AUI._