mtest: implement TAP parsing

This provides an initial support for parsing TAP output.  It detects failures
and skipped tests without relying on exit code, as well as early termination
of the test due to an error or a crash.

For now, subtests are not recorded in the TestRun object.  However, because the
TAP output goes on stdout, it is printed by --print-errorlogs when a test does
not behave as expected.  Handling subtests as TestRuns, and serializing them
to JSON, can be added later.

The parser was written specifically for Meson, and comes with its own
test suite.

Fixes #2923.

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