Clean up constants/internalConstants aliases in blockly.js #5554
Description
In #5140 a number of aliases were added to blockly.js with the following work left as follow-up:
- Investigate each of the properties (now in the list of aliases at the bottom of blockly.js) to decide which ones are not actually public, if any.
- Add deprecation warnings to any properties that are public but that we will remove in an upcoming release.
- Add setters for any properties that we will keep visible past this quarter.