feat: Implement compiler and virtual machine for Fig language

- Added Compiler class with methods for compiling programs, statements, and expressions.
- Introduced Proto structure to hold compiled bytecode and constants.
- Implemented expression compilation including literals, identifiers, and infix expressions.
- Developed statement compilation for variable declarations and expression statements.
- Created a VM class to execute compiled bytecode with support for arithmetic and comparison operations.
- Added Object and Value classes for handling different data types and memory management.
- Implemented String and Struct objects for enhanced data representation.
- Established a parser for parsing variable declarations and statements.
- Included tests for the VM and object representations.

src/Ast/Ast.hpp

@@ -14,4 +14,5 @@
 #include <Ast/Expr/LiteralExpr.hpp>
 #include <Ast/Expr/PrefixExpr.hpp>
 
+#include <Ast/Stmt/ExprStmt.hpp>
 #include <Ast/Stmt/VarDecl.hpp>