chore: Add static optimizer with seperated method.

[He-Pin]

Motivation:
Try to re-add #344 back.

@stephenamar-db , How about this one? I separate the code into dedicated methods.

[stephenamar-db]

I need more time to look.
Removing all remaining static optimizations for booleans actually improves performance. There's something going on that I don't get.

[He-Pin]

@stephenamar-db I'm fine, our use case is the scripts are been parsed and we will use them several times, as the current parse caches are separated for script and extVar and tlaVar, so it would be better to cache a parsed and optimized scripts' AST.

Another thing is if the tableSwitch did not affect the performance, we can make use of it to do a quick O(1) jump, my current work is not been blocked by any of this, let's take it easy, thank you.