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[CI] Code coverage reports


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

I went ahead and experimented with another free service,  I
got it to work with our C++ and Rust code bases.  An example report can
be seen here:

The proposed changes are in PR #2023.

The two platforms, and, 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 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?