[plsql] Fix for #3647 -- added TypeScript and JavaScript ports #3650
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This PR fixes #3647.
For this PR, the grammar was ported to JS and TS, requiring a few changes to bring it into "target agnostic format". The JS port was working already and the TS port just needed a few changes to make it work for the official Antlr TypeScript runtime. A small subset of "Hello World" examples was added to test the JS and TS ports because the parser is pretty slow.