crypto/internal/fips140test: add cSHAKE ACVP tests

crypto/internal/fips140test: add cSHAKE ACVP tests

Adds ACVP test coverage for the SP 800-185 cSHAKE-128 and cSHAKE-256
algorithms based on the NIST spec:

  https://pages.nist.gov/ACVP/draft-celi-acvp-xof.html

Updates #69642

Change-Id: I4a6ef9a99dfe520f3177e0e7c258326475690f5f
Reviewed-on: https://go-review.googlesource.com/c/go/+/648455
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>