what the max msg body size consumer supported

when I consumer some msg ，I got exception
```
terminate called after throwing an instance of "boost::exception_detail::clone_ipml>"

what(): zlib error
```
the original msg more than 7000 byte , After I delete some fields, msg size only 4000byte , and I solve this exception

my enviorment

os：rhel7.9

python： 3.9.16

rocket-client-cpp-2.0.0-centos.x86_64

rocketmq-client-python 2.0.0