feat: `parseTo` which accepts a string that has normal javascript accessor expressions

[schveiguy]

parseTo takes a string[]... parameter which parses the tokenizer to nested aggregates matching the names given.

For example:

{"a" : {"b": {"c": 5}}}

tokenizer.parseTo("a", "b", "c"); will position the tokenizer at the 5.

But would be much better UX to have it like tokenizer.parseTo("a.b.c");.

The biggest issue is that this syntax already matches the current parseTo function. So we need a new name for it.

Ideas:

• parseJson
• parseExpr
• query