[Zr v1.0] Interpreter Reimplementation

[Vorlias]

Parallel update for
roblox-aurora/zirconium-ast#14

Goals

• Execute CommandStatements
• Set variables in VariableDeclarations in the current stack
• Handle control flow with if/else
• Handle iteration with for-in
• Handle complex variable-based expressions such as ArrayIndexExpression and PropertyAccessExpression
• Handle function execution only when called, but keep information in stack
• ForInStatement should take values from the rhs expression and pass them to the next block as local(s)
• Block should keep local identifiers to the scope
• FunctionDeclaration should accept values passed to it in order of arguments or (with keys - the argument names)
• Handle Lexer errors
• Handle Parser errors

Will update this if I missed anything.