mtest: add option to slice tests

Executing tests can take a very long time. As an example, the Git test
suite on Windows takes around 4 hours to execute. The Git project has
been working around the issue by splitting up CI jobs into multiple
slices: one job creates the build artifacts, and then we spawn N test
jobs with those artifacts, where each test job executes 1/Nth of the
tests.

This can be scripted rather easily by using `meson test --list`,
selecting every Nth line, but there may be other projects that have a
similar need. Wire up a new option "--slice i/n" to `meson test` that
does implements this logic.

Signed-off-by: Patrick Steinhardt <ps@pks.im>

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