setErrorHandler method is missing from Parser class in TypeScript target

I extended DefaultErrorStratergy class to customize the ANTLR error messages

The Java implementation (and the documentation for the BailErrorStrategy) suggest that such a method should exist.

After staring at the source, the only way I've found to change the error strategy is to modify the **_errHandler** field of the parser directly which is also not working as expected to customize the error messages



Start with the TypeScript target's Parser class and compare its error-handling API with the Java implementation and BailErrorStrategy documentation. Investigate how _errHandler is used and determine the expected public way to customize error messages; done means the missing method is available and custom error handling works as described.

Written by the indexing model from the issue text.