doxygen 文档 (#189)

### What problem were solved in this pull request?

Issue Number: close #188 

Problem:
利用doxygen将代码注释生成文档

### What is changed and how it works?
修改github action，增加doxygen生成文档，并gihtub pages部署发布

### Other information

.github/workflows/jekyll-gh-pages.yml

@@ -32,9 +32,10 @@ jobs:
           submodules: false
 
       - name: Doxygen Action
-        run: mattnotmitt/doxygen-action@v1.9.5
-        working-directory: .
-        doxyfile-path: ./Doxyfile
+        uses: mattnotmitt/doxygen-action@v1.9.5
+        with:
+          working-directory: .
+          doxyfile-path: ./Doxyfile
 
       - name: Setup Pages
         uses: actions/configure-pages@v3

.gitignore

@@ -3,6 +3,7 @@
 ./deps/googletest
 ./deps/jsoncpp
 ./deps/benchmark
+./docs/doxy/
 build/*
 build_*
 cmake-build-*/*

README.md

@@ -16,6 +16,7 @@ miniob 设计的目标是面向在校学生、数据库从业者、爱好者，
 4. [开发环境搭建(本地调试, 适用 Linux 和 Mac)](docs/how_to_dev_miniob_by_vscode.md)
 5. [开发环境搭建(远程调试, 适用于 Window, Linux 和 Mac)](docs/how_to_dev_in_docker_container_by_vscode.md)
 6. [miniob 词法语法解析开发与测试](docs/miniob-sql-parser.md)
+7. [doxygen 代码文档](docs/doxy/html/index.html)
 
 更多的文档, 可以参考 docs 目录下的文档, 为了帮助大家更好的学习数据库基础知识, OceanBase 社区提供了一系列教程, 建议学习: