Add sol::lib::jit to actually enable JIT ( resolves #899 )

[WSSDude]

Resolves #899 .

See comment #899 (comment)

[WSSDude]

Just an additional note - I also try to run the test without LuaJIT in the first place, just LuaJIT about doubles the performance, but this makes it like 3x faster against just regular Lua package (Lua 5.4 version) for the linked test in the issue.

[maximegmd]

I think we should make this an option, given that we haven't used JIT for so long we may be running into some bugs, if we can give the option to disable it, people have options until the potential issues are resolved.

[WSSDude]

Good point, I'll add some setting for it. Will we enable it by default?

[maximegmd]

I think we should enable it by default and explain that people can disable it if they encounter new errors

[WSSDude]

Added it as an option, defaulted to true 👍