Add a test recipe for testing the speed command

Add a test recipe for testing the speed command

Previously there was no test for the speed command. We just do some simple
testing, running the command with various options to confirm that it doesn't
crash or report errors. We use the new -testmode option to ensure that this
happens quickly and doesn't really run full speed tests.

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25153)