feat(ir2mcode): 添加中间代码到统一输出格式转换模块

- 在.gitignore中添加*.pdb和*.dmp文件类型以忽略调试符号文件
- 重构libs/README.md文档，为各组件添加详细的功能说明和层级结构
- 创建ir2mcode模块的cbuild.toml配置文件，定义依赖关系
- 实现scc_ir2sccf功能，提供MIR到SCCF格式转换的核心接口
- 添加必要的头文件声明和基础实现框架

libs/ir2mcode/cbuild.toml

@@ -0,0 +1,14 @@
+[package]
+name        = "ir2mcode"
+version     = "0.1.0"
+authors     = []
+description = ""
+
+dependencies = [
+    { name = "scc_utils", path = "../../runtime/scc_utils" },
+    { name = "scc_mir", path = "../ir/mir" },
+    { name = "scc_mcode", path = "../mcode" },
+    { name = "sccf", path = "../sccf" },
+]
+# features = {}
+# default_features = []