dynamodb/attributevalue: Marshal does not support json.Number to Numeric data type

[KaibaLopez]

Is your feature request related to a problem? Please describe.
The deprecated dynamodbattribute.ConvertTo(...) has broader functionality than the new dynamdbattribute.Marshal(...).

Describe the solution you'd like
Ideally, the new function should be able to convert json.Number type to the numeric dynamodb data type N or the sdk should have another non-deprecated function for making that conversion.

Additional context
Refer to V1 issue #3643 for code samples and explanation.

[github-actions]

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