Fetched field name using PropertyDescriptor to fix fields with upper …

[ghost]

…case starting letter.

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Description of changes:

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[ghost]

Had a requirement where we are saving data with the key for e.g. CONTACT_US This automatically changes to cONTACT_US while saving in the dynamo due to the method fieldNameOf in StandardBeanProperties. Sent it as a default name and fetched using java.beans.PropertyDescriptor

[ghost]

Can someone from AWS review and merge ?

[ghost]

@debora-ito I see you active on other PR's hence tagging for review.

[jivesh-threja]

Shows ghost PR as had to merge GitHub accounts. PR created by @jivesh-threja