[Feature request] Easier debugging

[matthew-dean]

One thing that's nice about Chevrotain is the debugging experience. You can set breakpoints in VSCode and step through and see is it makes "decisions" about which path to take. WIth a relatively small lookahead, these are easy to grok.

However, I'm finding that with this lookahead strategy, it's much harder to discern why Chevortain didn't take a certain path. It would be nice if there was a way to log (or inspect?) why a subrule wasn't chosen or was determined not to match the input.

Is something like that possible?