[feat] trpc-springmvc JDK 21 is not supported

[Qi382]

I'm currently using the module of trpc-spring-mvc.

However, I've found that TRpcServiceHandlerMapping references javax.servlet.http.HttpServletRequest, which will cause a ClassNotFoundException on JDK 21.

Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest

I'd like to ask if there are any upgrade or compatibility plans.

see trpc-spring-support/trpc-springmvc/src/main/java/com/tencent/trpc/springmvc/TRpcServiceHandlerMapping.java#L28

[wardseptember]

这个问题我们也在调研如何更好的兼容，目前线上使用最多的jdk8，其次是jdk11。这个问题后续会解决的