BugFix: fix the following bugs

[chhy2009]

• unable to view fiber stack using gdb in python3
• prossible timeout in low qps situation when using connection reuse mode
• compatibility with the threadmodel_type field

[codecov]

Codecov Report

Merging #85 (9b70f9c) into main (0a23ad4) will decrease coverage by 0.06738%.
Report is 1 commits behind head on main.
The diff coverage is 92.30769%.

❗ Current head 9b70f9c differs from pull request most recent head b60eaa5. Consider uploading reports for the commit b60eaa5 to get more accurate results

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main         #85         +/-   ##
===================================================
- Coverage   81.81468%   81.74730%   -0.06738%     
===================================================
  Files            855         855                 
  Lines          33725       33732          +7     
===================================================
- Hits           27592       27575         -17     
- Misses          6133        6157         +24     

Files	Coverage Δ
trpc/client/service_proxy_manager.cc	98.30508% <100.00000%> (+0.02922%)	⬆️
trpc/client/service_proxy_option_setter.cc	98.18182% <100.00000%> (+0.05097%)	⬆️
trpc/common/config/client_conf_parser.h	100.00000% <100.00000%> (ø)
trpc/common/config/server_conf_parser.h	99.28058% <100.00000%> (+0.01587%)	⬆️
...lient/future/future_tcp_connector_group_manager.cc	96.92308% <100.00000%> (-0.09186%)	⬇️
trpc/transport/client/future/future_transport.cc	84.19244% <0.00000%> (ø)

... and 11 files with indirect coverage changes