sha3: make it mostly a wrapper around crypto/sha3

crypto/sha3 was introduced in Go 1.24, which is now the minimum Go
version of this module.

Made the hashes go:fix inline wrappers, since the new types can be used
as hash.Hash directly.

The SHAKE instances need a wrapper for the methods we dropped from
crypto.XOF, so no go:fix inline there.

Kept the generic implementation for the legacy Keccak hashes we did not
bring to the standard library. We need to keep them working, but they
don't need to be fast.

Fixes golang/go#73681
Updates golang/go#65269

Change-Id: I6a6a69648b6353b153c70a2cec84864e64dcd61b
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/710115
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>

Author: FiloSottile