Part of #3766

Merge main (7.x) branch into experimental-apex-parser and fix tests.

Conflict resolution and fixes include:
* Create root ASTApexFile nodes
* Correct source locations
* Insert comments by offset rather than line/column, using more of the mainline code
* Removed some unused methods
* Suppress Summit logger INFO output
* Suppress some (but not all) ANTLR version mismatch output
* Replace ASTFormalComment.getToken() with getImage()
* Remove deleted APIs: getLocation, hasSuppressWarningsAnnotationsFor, getModifiers
* Remove code that was factored into BaseApexClass
* Replace all references to Jorje in rules
* Passing AbstractApexNode instead of ApexNode during tree building
* Extending and using TextFileContent to convert line+column (as is native in Summit) to offset
* Using the new visitor method and interface
* Replace ApexRootNode with BaseApexClass
* Remove AbstractApexNodeBase