Provide support to serialize dates in util-dynamodb

[trivikr]

Is your feature request related to a problem? Please describe.
util-dynamodb currently throws error when date is passed.
Refs: #1531

Describe the solution you'd like
The problem is with JSON spec itself: there is no literal syntax for dates in JSON.
JSON spec: https://www.ietf.org/rfc/rfc4627.txt

Possible solution #1: Convert dates to ISO 8601 strings by default. Provide an option (say convertDateToNumber) which converts date to a string value. This option can be passed along with convertEmptyValues

Possible solution #2: Expose pre-marshall configuration allowing users to send their own convert functions, detailed in #1533

Describe alternatives you've considered
Converting dates to String/Number or a different format before passing it to the converter.

Additional context
This request was raised in PR #1531 (comment)

[trivikr]

If we go ahead with using JSON.stringify() for serializing objects as suggested in #1535, then date will be stored as a String in ISO 8601 format.

We still need to discuss adding convertDateToNumber (or similar) option, which converts date to number (output of .getTime()) instead of string.

[russell-dot-js]

I like the idea of ISO 8601 by default, especially considering nobody wants the current default behavior of serializing to {}. That being said, it's only OK if we allow a way out of it.

convertDateToNumber, just like convertEmptyValues, seems like a trap to me, as it could be a slippery slope:

• convertBufferToArray
• convertPromiseToAwaited
• convertArrayToSet
• convertBigIntToString
• convertGoToRust

Hence I prefer letting consumers inject their own serialization preferences - nothing is stopping them from re-using and composing their rules as they see fit

[trivikr]

Update: we're exploring serialization of Date objects using premarshalling #1533 (comment)

[github-actions]

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