fix: [go] make staticData variable threadsafe

[swist]

I've hit a bug developing a go parser and running multiple instances of it with t.Parallel()

Turned out that staticData var was a global and would throw concurrent data access errors when running the test suite with -race

This commit fixes it by doing the following:

1. turn <parser.grammarName; format="cap">ParserStaticData into a struct
2. Teach <parser.name; format="cap">Init() to return a pointer to new instance of this struct
3. Teach <parser.name; format="cap">Init() to initialize it upon construction
4. Teach the parser constructor to use its own value for this var rather than a global
   I took similar steps for the Lexer

I've been able to run 10000 concurrent parsers in this setup without having any performance/memory usage problems