internal/trace: add "command" to convert text traces to raw
This is primarily helpful for parsing traces dumped via CI.
cmd/dist doesn't like commands in std which are not actually part of the
Go distribution. So rather than using a real command, this is actually a
test which does the conversion.
Change-Id: I6a6a636c829a4acc0bce8cf7548105ad59d83c67
Reviewed-on: https://go-review.googlesource.com/c/go/+/716882 Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>