+ implement dynamic parsing and validation test suite for TDLtx

* refactored TDLtxParsingTest to use JUnit 5 @TestFactory for automatic discovery of .tdltx files
* added 12 test models covering Part 1 grammar (Data, Behaviour, Time, Configuration)
* added structural snapshot verification (.expected files) to detect syntax ambiguity
* integrated ValidationTestHelper for full semantic validation
* added EPackage registration to TDLtxInjectorProvider for standalone execution
* added Ant build file and README for CI/CD and developer usage