New benchmarks tests & `TestSuite` update

[SnorlaxAssist]

• Added speed tests in benchmarks
• Added CodeGen to the TestSuite.
• For Luau context tests,CodeGen api of Fiu is given if compiled correctly, variables are exposed to let tests know the status of FiuCodeGen api.

--!ctx Luau
-- <boolean> true for `FiuCodeGen` api to be powered using CodeGen, otherwise it is interpreted, same as `Fiu` api.
FiuCodeGen.__codegenReady