[#276] Merge repo with frostfs-api-go

Signed-off-by: Pavel Pogodaev <p.pogodaev@yadro.com>

api/ape/string.go

@@ -0,0 +1,18 @@
+package ape
+
+import (
+	apegrpc "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/ape/grpc"
+)
+
+func (tt TargetType) String() string {
+	return TargetTypeToGRPCField(tt).String()
+}
+
+func (tt *TargetType) FromString(s string) bool {
+	i, ok := apegrpc.TargetType_value[s]
+	if ok {
+		*tt = TargetType(i)
+	}
+
+	return ok
+}