provide a configurable log at client-side

User Story

As an application developer/support engineer, I want a client-side debugging log, so that it can give me hints and more information during debugging at run-time.

Acceptance Criteria

1. it can be enabled by a library property (separate from debug-js)
2. After enabling the debugging log, it can show some key statuses detected by ZK including

• browser version
• ROD enabled status (for each related component)
• mobile browser, touch device

3. If it's not enabled, zk should not load the log javascript in a browser.

Details

• https://www.log4javascript.org/