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[CI] Code coverage reports


Hi,

Previous efforts to gather and publish C++ code coverage using the free
service provided by coveralls.io have stalled (see ARROW-27).

I went ahead and experimented with another free service, codecov.io.  I
got it to work with our C++ and Rust code bases.  An example report can
be seen here:
https://codecov.io/gh/apache/arrow/list/8804ab50118f46139986acc435d740cb536f08f4/

The proposed changes are in PR #2023.

The two platforms, codecov.io and coveralls.io, seem largely similar:
they provide free hosting for code coverage reports, support a range of
programming languages and code coverage formats, and display compute
coverage changes accross repository commits.  I find codecov.io slightly
more readable but that's just a personal opinion.

Do people or the Apache project have a strong preference for one of
those two services?

Regards

Antoine.