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添加RISC-V架构支持
实现内容
为openGauss-embedded项目添加RISC-V 64位架构支持，使项目能够在RISC-V平台上成功编译和运行。
根因分析
openGauss-embedded项目原本只支持x86_64和ARM架构(aarch64)，代码中包含了大量架构相关的指令和实现，如x86特有的SSE指令集、内存屏障(mfence)、自旋锁(pause指令)等，这些在RISC-V架构上不可用。
实现方案
具体修改文件包括：
关联需求或issue
在RISC-V架构上编译运行openGauss-embedded，测试sql脚本。
开发自验报告
自验结果：在RISC-V 64位平台(riscv64)上成功编译并运行openGauss-embedded，所有功能正常
fastcheck测试用例：可添加RISC-V架构检测的测试用例，验证在该架构上所有组件是否正常工作
资料修改：需要在README.md中添加对RISC-V架构支持的说明，包括支持的版本和编译方法
升级场景：本次修改仅涉及编译时架构支持，不涉及系统表、日志格式或运行态数据格式变更
扩展场景：不影响在线扩容等扩展场景
异常场景考虑：
对其他模块影响：所有修改都有架构条件判断，不影响现有x86_64和aarch64架构的功能
补丁版本回合：不需要回合到补丁版本，仅为新增架构支持
其他说明
这是首次为openGauss-embedded添加RISC-V支持，后续可能需要进一步优化性能和稳定性。建议在各种负载下进行全面测试，特别是原子操作和内存屏障的实现对并发性能可能有影响。