binarycaching: implement x-aws-config,trace-ops #1864
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Description
The issue
When a developer perform CMake configuration on a complex project using AWS S3 as a cache backend,
vcpkgis apparently stuck for many minutes.In reality it is just doing I/O with AWS S3 to download one by one pre-built packages.
The solution
This contribution add option
x-aws-config,trace-opsto thex-awscaching backend to obtain a feedback when the tool is downloading caches from an S3 bucket.The solution is also useful for debugging purposes and it is 100% optional.