Add support for dynamodbav

[rmennes]

Add support for DynamoDB AttributeValue Marshaller. https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue

[codecov-commenter]

Codecov Report

Merging #72 (b449598) into master (71d3edd) will increase coverage by 0.00%. The diff coverage is 57.14%.

@@           Coverage Diff           @@
##           master      #72   +/-   ##
=======================================
  Coverage   66.23%   66.24%           
=======================================
  Files           4        5    +1     
  Lines         465      471    +6     
=======================================
+ Hits          308      312    +4     
- Misses        146      148    +2     
  Partials       11       11           

Impacted Files	Coverage Δ
stringer.go	60.93% <40.00%> (-0.11%)	:arrow_down:
dynamodbav.go	100.00% <100.00%> (ø)

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