Enhance access log

[samanhappy]

Resolve #301, this PR is trying to enhance access log by

• include request headers and response headers
• make access log format configurable

[codecov-commenter]

Codecov Report

Base: 75.89% // Head: 75.84% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (30e40ce) compared to base (5600a4b).
Patch coverage: 48.21% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #901      +/-   ##
==========================================
- Coverage   75.89%   75.84%   -0.06%     
==========================================
  Files         115      115              
  Lines       13464    13497      +33     
==========================================
+ Hits        10219    10237      +18     
- Misses       2668     2683      +15     
  Partials      577      577              

Impacted Files	Coverage Δ
pkg/object/httpserver/spec.go	76.19% <ø> (ø)
pkg/object/httpserver/mux.go	77.60% <48.21%> (-3.29%)	⬇️
pkg/object/autocertmanager/autocertmanager.go	94.28% <0.00%> (+0.81%)	⬆️

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