g3-icap-client: decode http body if content-length is known

[zh-jq-b]

close #390

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.70115% with 184 lines in your changes missing coverage. Please review.

Project coverage is 50.75%. Comparing base (ff4b6a6) to head (be844c0).

Files with missing lines	Patch %	Lines
lib/g3-icap-client/src/reqmod/h1/bidirectional.rs	0.00%	50 Missing ⚠️
lib/g3-http/src/client/transparent.rs	43.13%	29 Missing ⚠️
lib/g3-http/src/client/response.rs	42.55%	27 Missing ⚠️
lib/g3-icap-client/src/respmod/h1/recv_response.rs	56.86%	22 Missing ⚠️
lib/g3-icap-client/src/respmod/h1/bidirectional.rs	63.63%	20 Missing ⚠️
lib/g3-icap-client/src/reqmod/h1/recv_request.rs	72.72%	15 Missing ⚠️
lib/g3-http/src/server/request.rs	81.63%	9 Missing ⚠️
lib/g3-http/src/server/transparent.rs	83.01%	9 Missing ⚠️
lib/g3-icap-client/src/reqmod/h1/forward_body.rs	0.00%	1 Missing ⚠️
lib/g3-icap-client/src/reqmod/h1/preview.rs	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
+ Coverage   50.73%   50.75%   +0.02%     
==========================================
  Files        1091     1091              
  Lines       99530    99767     +237     
==========================================
+ Hits        50498    50640     +142     
- Misses      49032    49127      +95     

Flag	Coverage Δ
g3proxy	50.76% <57.70%> (+0.02%)	⬆️
lib	25.28% <0.00%> (-0.13%)	⬇️

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