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.

xmake.lua

@@ -44,10 +44,34 @@ target("ParserTest")
 
     add_files("src/Ast/Operator.cpp")
     add_files("src/Parser/ExprParser.cpp")
+    add_files("src/Parser/StmtParser.cpp")
     add_files("src/Parser/Parser.cpp")
 
     add_files("src/Parser/ParserTest.cpp")
 
+target("ObjectTest")
+    add_files("src/Object/Object.cpp")
+    add_files("src/Object/ObjectTest.cpp")
+
+target("CompilerTest")
+    add_files("src/Core/*.cpp")
+    add_files("src/Token/Token.cpp")
+    add_files("src/Error/Error.cpp")
+    add_files("src/Lexer/Lexer.cpp")
+
+    add_files("src/Ast/Operator.cpp")
+    add_files("src/Parser/ExprParser.cpp")
+    add_files("src/Parser/StmtParser.cpp")
+    add_files("src/Parser/Parser.cpp")
+
+    add_files("src/Object/Object.cpp")
+
+    add_files("src/Compiler/ExprCompiler.cpp")
+    add_files("src/Compiler/StmtCompiler.cpp")
+    add_files("src/Compiler/Compiler.cpp")
+    
+    add_files("src/Compiler/CompileTest.cpp")
+
 target("Fig")
     add_files("src/Core/*.cpp")
     add_files("src/Token/Token.cpp")
@@ -56,6 +80,14 @@ target("Fig")
 
     add_files("src/Ast/Operator.cpp")
     add_files("src/Parser/ExprParser.cpp")
+    add_files("src/Parser/StmtParser.cpp")
     add_files("src/Parser/Parser.cpp")
-    
+
+    add_files("src/Object/Object.cpp")
+
+    add_files("src/Compiler/ExprCompiler.cpp")
+    add_files("src/Compiler/StmtCompiler.cpp")
+    add_files("src/Compiler/Compiler.cpp")
+
+    add_files("src/VM/VM.cpp")
     add_files("src/main.cpp")