DynamoDb marshaler ignores a name tag for embeded structs

[ztison]

Describe the bug

When marshaling the Go object with the embedded struct the name tag is ignored, so the fields from the embedded struct are always inlined. Which could cause unexpected behavior when we have the same field name in the object and in the embedded struct.

Expected Behavior

Marshaller should use the name tag and create a nested map attribute. The same way as the JSON marshaller does.

Reproduction Steps

package main

import (
	"log"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	dynamodbtypes "github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

type MetaObject struct {
	Org string `json:"org"`
}

type DataObject struct {
	MetaObject `json:"metadata"`
	Name       string `json:"name"`
}

func main() {
	encoder := attributevalue.NewEncoder(func(options *attributevalue.EncoderOptions) {
		options.TagKey = "json"
	})

	encoded, _ := encoder.Encode(&DataObject{
		MetaObject: MetaObject{Org: "org-1"},
		Name:       "name-1",
	})

	encodedMap := encoded.(*dynamodbtypes.AttributeValueMemberM)

	if _, ok := encodedMap.Value["metadata"]; !ok {
		log.Fatalf("metadata field is missing!")
	}
}

Possible Solution

Create a new encoder option to disable default inlining behavior.

Additional Information/Context

No response

AWS Go SDK V2 Module Versions Used

github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue@v1.10.11
github.com/aws/aws-sdk-go-v2/service/dynamodb@v1.18.2
github.com/aws/aws-sdk-go-v2/service/dynamodbstreams@v1.14.2

Compiler and Version used

go version go1.19.5 darwin/arm64

Operating System and version

macOS Venture 13.1

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