### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

DynamoDB does not correctly namespace resources based on region and account ID. 

For instance, using the same table name across accounts and regions throws an error.

### Expected Behavior

It must be possible to create resources with same name on different regions and/or different accounts.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

```
  $ AWS_ACCESS_KEY_ID=445500880268 AWS_DEFAULT_REGION=eu-central-1 \
    awslocal dynamodb create-table --table-name CertificateTargets-local1 \
        --key-schema AttributeName=target_uuid,KeyType=HASH \
        --attribute-definitions AttributeName=target_uuid,AttributeType=S \
        --provisioned-throughput ReadCapacityUnits=1000,WriteCapacityUnits=1000

  $ AWS_ACCESS_KEY_ID=445500880268 AWS_DEFAULT_REGION=us-east-1 \
    awslocal dynamodb create-table --table-name CertificateTargets-local1 \
        --key-schema AttributeName=target_uuid,KeyType=HASH \
        --attribute-definitions AttributeName=target_uuid,AttributeType=S \
        --provisioned-throughput ReadCapacityUnits=1000,WriteCapacityUnits=1000

    # ResourceInUseException!

  $ AWS_ACCESS_KEY_ID=000000000000 \
    awslocal dynamodb create-table --table-name CertificateTargets-local1 \
        --key-schema AttributeName=target_uuid,KeyType=HASH \
        --attribute-definitions AttributeName=target_uuid,AttributeType=S \
        --provisioned-throughput ReadCapacityUnits=1000,WriteCapacityUnits=1000

    # ResourceInUseException!
```

### Environment

```markdown
OS: Ubuntu 22.04
LocalStack: latest
```


### Anything else?

_No response_
for schema in schemas:
                for key in schema:
                    key_name = key["AttributeName"]
                    key_value = put_item["Item"].get(key_name)
                    if not key_value:
                        raise ValidationException(
                            "The provided key element does not match the schema"
                        )
                    search_key[key_name] = key_value
            if not search_key:
                return
        req = {"TableName": table_name, "Key": search_key}
        existing_item = aws_stack.dynamodb_get_item_raw(req)
        if not existing_item:
            return existing_item
        if "Item" not in existing_item:
            if "message" in existing_item:
                table_names = ddb_client.list_tables()["TableNames"]
                msg = (
                    "Unable to get item from DynamoDB (existing tables: %s ...truncated if >100 tables): %s"
                    % (
                        table_names,
                        existing_item["message"],
                    )
                )
                LOG.warning(msg)
            return
        return existing_item.get("Item")
    @classmethod
    def list_existing_items_for_statement(cls, partiql_statement: str) -> List: