benchmarks/cmd/bent: adding benchmarks for toml and wazero

For toml, which benchmarks to run,
for wazero, a provisional list of "good" benchmarks to run.

Change-Id: I2544a6450e55716315345e5223b7a556d8e2813b
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/595998
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>