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/Parser/Parser.cpp

@@ -10,9 +10,18 @@
 
 namespace Fig
 {
-    DynArray<AstNode *> Parser::parseAll()
+    Result<Program *, Error> Parser::Parse()
     {
-        DynArray<AstNode *> nodes;
-        return nodes;
+        Program *program = new Program;
+        while (!isEOF)
+        {
+            const auto &result = parseStatement();
+            if (!result)
+            {
+                return std::unexpected(result.error());
+            }
+            program->nodes.push_back(*result);
+        }
+        return program;
     }
 };