Race condition in MVELDialectRuntimeData.getParserConfiguration

MVELDialectRuntimeData attempts to hold a lazy loaded ParserConfiguration. The getParserConfiguration method sets this to a new configuration object and then sets the imports on the configuration. Between these two steps another thread could retrieve the stale configuration and use it. This could result in a number of exceptions in compilation.

A simple fix is to delay assignment of new ParserConfiguration until after the imports are set.