Use NEO3 based address generation

With neo-go v0.90.0 there are new event subscription component
and new verification script routines based on NEO3. These features
allow to avoid using low-level neo-vm code in NeoFS and corresponding
projects.

This commit removes unused function:
- FetchPublicKeys (used in neofs indexer),
- VerificationScript (used in KeysToAddress),
- Address (used in KeysToAddress),
- ReversedScriptHashToAddress (used in neofs indexer),
- IsAddress (used in neofs indexer),
- ReverseBytes (used in neofs indexer),
- DecodeScriptHash (used in neofs indexer).

KeysToAddress changed into KeyToAddress because NeoFS won't work with
multisignature owners for now and it is not supported in neo-go library.

refs/owner.go

@@ -9,18 +9,22 @@ import (
 	"github.com/pkg/errors"
 )
 
-// NewOwnerID returns generated OwnerID from passed public keys.
-func NewOwnerID(keys ...*ecdsa.PublicKey) (owner OwnerID, err error) {
-	if len(keys) == 0 {
+// NewOwnerID returns generated OwnerID from passed public key.
+func NewOwnerID(key *ecdsa.PublicKey) (owner OwnerID, err error) {
+	if key == nil {
 		return
 	}
+
 	var d []byte
-	d, err = base58.Decode(chain.KeysToAddress(keys...))
+
+	d, err = base58.Decode(chain.KeyToAddress(key))
 	if err != nil {
 		return
 	}
+
 	copy(owner[:], d)
-	return owner, nil
+
+	return
 }
 
 // Size returns OwnerID size in bytes (OwnerIDSize).

refs/types_test.go

@@ -66,7 +66,7 @@ func TestOwnerID(t *testing.T) {
 	t.Run("check that marshal/unmarshal works like expected", func(t *testing.T) {
 		var u1, u2 OwnerID
 
-		owner, err := NewOwnerID()
+		owner, err := NewOwnerID(nil)
 		require.NoError(t, err)
 		require.True(t, owner.Empty())