[sql/hive/v3] ResourcePlanParser.g4 does not define "identifier".

[kaby76]

For the latest version of the Trash Toolkit, I modified the code to do a better, and hopefully bug-free, analysis of grammars. The top-level grammar ResourcePlanParser.g4 is not included by any other grammar (so it is top-level), and it does not import other .g4's. But, the grammar is invalid because it does not define identifier, so it should probably be removed, renamed, or a fake top-level grammar created to just import the damn thing.