[JavaScript|Python] DateTimeV2 support for it-it

[bobokids]

Describe the bug
A clear and concise description of what the bug is.
Please refer to microsoft/botframework-components#282. it-it does not support datetimev2 entity.

Platform:

• Platform: JavaScript, Python

[tellarin]

@bobokids, DateTimeV2 is already supported in .NET.
Would yo be able to help porting it to JavaScript/Python?