The most important change is that all bench scripts now must always
output to `measurements.jsonl` instead of being allowed to output
results on stdout/err.
This PR adds per-module `.ilean` and `.olean` file size metrics, global
and per-module cycle counting, and adds back `lean --stat`-based
metrics. It also renames some `size/*` metrics to get rid of the name
`stdlib`.
This PR adds a new [radar]-based [temci]-less bench suite that replaces
the `stdlib` benchmarks from the old suite and also measures per-module
instruction counts. All other benchmarks from the old suite are
unaffected.
The readme at `tests/bench-radar/README.md` explains in more detail how
the bench suite is structured and how it works. The readmes in the
benchmark subdirectories explain what each benchmark does and which
metrics it collects.
All metrics except `stdlib//max dynamic symbols` were ported to the new
suite, though most have been renamed.
[radar]: https://github.com/leanprover/radar
[temci]: https://github.com/parttimenerd/temci
