Extended support of vshard errors

[nurzhan-saktaganov]

In some cases vshard error may contain field err.destinaion.
See: https://github.com/tarantool/vshard/blob/b6fdbe950a2e4557f05b83bd8b846b126ec3724e/vshard/router/init.lua#L665

But we don't support this field yet:

go-vshard-router/api.go

Lines 43 to 52 in b086a19

	type StorageCallVShardError struct {
	BucketID uint64 `msgpack:"bucket_id" mapstructure:"bucket_id"`
	Reason string `msgpack:"reason"`
	Code int `msgpack:"code"`
	Type string `msgpack:"type"`
	Message string `msgpack:"message"`
	Name string `msgpack:"name"`
	MasterUUID *string `msgpack:"master_uuid" mapstructure:"master_uuid"` // mapstructure cant decode to source uuid type
	ReplicasetUUID *string `msgpack:"replicaset_uuid" mapstructure:"replicaset_uuid"` // mapstructure cant decode to source uuid type
	}