crypto/internal/fips140test: add ECDSA ACVP tests

crypto/internal/fips140test: add ECDSA ACVP tests

This commit adds ACVP test coverage for the non-deterministic ECDSA
vectors (keyGen, keyVer, sigGen, sigVer) based on the NIST spec:

  https://pages.nist.gov/ACVP/draft-fussell-acvp-ecdsa.html

Updates #69642

Change-Id: Iec8b18a247b0a652d13f9167a78de2cb74f4dfd0
Reviewed-on: https://go-review.googlesource.com/c/go/+/620935
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
TryBot-Bypass: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>