Support for registering multiple client and server filter

[phpcyy]

As far as I know, TarsGo supports registering client filter with tars.RegisterClientFilter() method.
And if you have multiple client filter, you may have to use tars.RegisterPreClientFilter and tars.RegisterPostClientFilter.

However, I don't want to split any of them to one pre filter and one post filter when I register multiple client filters.

For example, I register client breaker filter and client zipkin filter, they may both have pre handle logic and post handle logic.
In the current way, I can only register one client filter. And another client filter has to be split to one pre filter and one client filter.

I think it's a good idea that TarsGo supports muliple filter with using middlewares.