Generate parse tables for pgen2-native and hook it up to oil-native

[andychu]

This is to translate Oil expressions (including eggexes) to C++.

In some ways this is retreading what CPython already has. This is a good meaty issue that will move the project forward a lot, if anyone is good with C / C++ and wants to work with parsing algorithms.

[andychu]

@melvinw did this in #1540 ! Woohoo!

1fd961a

[andychu]

Released - https://www.oilshell.org/blog/2023/05/release-0.15.0.html