Add support for datetime

[kylepbit]

Description

Previously datetime types would result in an NPE on retrieval, as the conversion would be unsupported. Map datetime to timestamp to support it.

Issues Resolved

#252

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #255 (e2ba0a3) into main (6dae7b2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #255   +/-   ##
=========================================
  Coverage     99.90%   99.90%           
  Complexity     2638     2638           
=========================================
  Files           256      256           
  Lines          6442     6442           
  Branches        402      402           
=========================================
  Hits           6436     6436           
  Misses            5        5           
  Partials          1        1           

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[ghost]

This PR can be closed as commits do not have --signoff. #267 is a duplicate of this PR with --signoff.