Is your feature request related to a problem? Please describe.
We eventually want to support performing client side validation of search and provide suggestions depending on the term (via a custom visitor). But before that, we need to actually generate the ANTLRv4 code for typescript. This issue covers that.

Describe the solution you'd like

• A new npm workspace in package.json for the antlr code. Named lib/gen/antlrv4/ts-antlrv4.
• Update the gitignore to ignore the directory (should not be needed though because of this rule)
• Update the antlr-gen Makefile target to also call the typescript target
• Add any other needed files to make the new workspace valid. (Probably just a package.json like the other typescript generated workspace)