initial version of callback request logger

[jbrichau]

This is ongoing work to add better traceability to callbacks when trying to understand a log of requests in a front-end http server for Seaside.

[codecov]

Codecov Report

Attention: Patch coverage is 37.83784% with 115 lines in your changes missing coverage. Please review.

Project coverage is 51.78%. Comparing base (ea93a3d) to head (b66e4ef).
Report is 57 commits behind head on master.

Files with missing lines	Patch %	Lines
...ckage/WARequestLogItem.class/instance/renderOn..st	0.00%	12 Missing ⚠️
...ackage/WARequestLogItem.class/instance/printOn..st	0.00%	9 Missing ⚠️
...ARequestLoggerToolPlugin.class/instance/execute.st	0.00%	7 Missing ⚠️
...estLoggingFilter.class/instance/handleFiltered..st	0.00%	7 Missing ⚠️
...kage/WARequestLogItem.class/instance/initialize.st	0.00%	5 Missing ⚠️
...ARequestLogTool.class/instance/renderContentOn..st	0.00%	5 Missing ⚠️
...age/WATracingBlockWrapper.class/instance/value..st	0.00%	5 Missing ⚠️
...kage/WATracingBlockWrapper.class/instance/value.st	0.00%	5 Missing ⚠️
...TracingBlockWrapper.class/instance/value.value..st	0.00%	5 Missing ⚠️
...gBlockWrapper.class/instance/value.value.value..st	0.00%	5 Missing ⚠️
... and 13 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1482      +/-   ##
==========================================
+ Coverage   49.38%   51.78%   +2.40%     
==========================================
  Files        9117     9191      +74     
  Lines       80337    76878    -3459     
==========================================
+ Hits        39674    39812     +138     
+ Misses      40663    37066    -3597     

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