auto generate sql parser files #473
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What problem were solved in this pull request?
Issue Number: close #305
Problem:
当语法文件flex_sql.l和yacc_sql.y变更时，必须手动执行 gen_parser.sh 生成C++代码文件，比较麻烦。
What is changed and how it works?
cmake中增加 add_custom_command，在 flex_sql.l 和 yacc_sql.y文件变更时自动重新生成相关的C++代码文件。
当然在这些文件不存在时，也会执行gen_parser.sh生成代码。
Other information
将生成的代码文件加入了.gitignore，后续不需要再提交这些文件