feat: 解藕chat的处理器和请求器 (#772)

pkg/command/operators/default.py

pkg/command/operators/last.py

pkg/pipeline/bansess/bansess.py

pkg/pipeline/cntfilter/cntfilter.py

pkg/pipeline/cntfilter/filters/banwords.py

pkg/pipeline/longtext/longtext.py

pkg/pipeline/preproc/preproc.py

pkg/pipeline/process/handlers/chat.py

pkg/pipeline/process/process.py

pkg/pipeline/ratelimit/ratelimit.py

pkg/pipeline/resprule/resprule.py

pkg/pipeline/stagemgr.py

pkg/pipeline/wrapper/wrapper.py

pkg/provider/entities.py

pkg/provider/modelmgr/api.py

pkg/provider/modelmgr/apis/anthropicmsgs.py

pkg/provider/modelmgr/apis/chatcmpl.py