g3proxy: add support for periodic task logs

[zh-jq-b]

Close #294

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 26.22309% with 754 lines in your changes missing coverage. Please review.

Project coverage is 50.81%. Comparing base (4bea3a5) to head (38af3f8).

Files with missing lines	Patch %	Lines
g3proxy/src/log/task/http_forward.rs	2.06%	95 Missing ⚠️
g3proxy/src/log/task/ftp_over_http.rs	2.08%	94 Missing ⚠️
g3proxy/src/log/task/udp_connect.rs	2.43%	80 Missing ⚠️
g3proxy/src/inspect/stream/mod.rs	39.23%	79 Missing ⚠️
g3proxy/src/log/task/tcp_connect.rs	2.59%	75 Missing ⚠️
g3proxy/src/log/task/udp_associate.rs	2.70%	72 Missing ⚠️
g3proxy/src/serve/tcp_tproxy/task.rs	0.00%	28 Missing ⚠️
g3proxy/src/serve/sni_proxy/task/relay/task.rs	42.85%	16 Missing ⚠️
g3proxy/src/config/server/tcp_tproxy.rs	0.00%	14 Missing ⚠️
g3proxy/src/serve/http_proxy/task/connect/task.rs	50.00%	14 Missing ⚠️
... and 20 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #389      +/-   ##
==========================================
- Coverage   51.03%   50.81%   -0.23%     
==========================================
  Files        1092     1091       -1     
  Lines       98850    99515     +665     
==========================================
+ Hits        50451    50570     +119     
- Misses      48399    48945     +546     

Flag	Coverage Δ
g3proxy	50.81% <26.22%> (-0.23%)	⬇️
lib	25.40% <100.00%> (+0.03%)	⬆️

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