sofa-tracer redis plugin未串联父span

[renliangyu857]

Describe the bug

A clear and concise description of what the bug is.

Expected behavior

Actual behavior

拦截器中未在构建span前调用clientSend方法开启span并关联父span 导致执行完命令后，从context中取到的span为null

Steps to reproduce

Minimal yet complete reproducer code (or GitHub URL to code)

Environment

• SOFATracer version: 3.1.2
• Redis plugin version：3.1.3-snapshot
• JVM version (e.g. java -version):
• OS version (e.g. uname -a):
• Maven version:
• IDE version: