Create a new index table for Date

[jingtang10]

Is your feature request related to a problem? Please describe.
At the moment we only have one index table for DateTime which is a date time timezone information. But the Date can also be searched without timezone information. We need to create another index table for this.

Describe the solution you'd like
Create a Date index table with only epoch day information.

Describe alternatives you've considered
NA

Additional context
https://www.hl7.org/fhir/search.html#date

Would you like to work on the issue?
Yes