add WOQLQuery.date

[Francesca-Bit]

Please read https://github.com/terminusdb/terminusdb-client-python/blob/main/CONTRIBUTING.md
before submitting a pull request.

[rrooij]

It should pass the linter. You can run tox -e check to check for the linting errors.

[Francesca-Bit]

linting errors checked, please merge the pull request

[codecov]

Codecov Report

Merging #369 (01d1bc0) into main (1d04acc) will increase coverage by 0.04%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #369      +/-   ##
==========================================
+ Coverage   70.02%   70.06%   +0.04%     
==========================================
  Files          11       11              
  Lines        3806     3812       +6     
==========================================
+ Hits         2665     2671       +6     
  Misses       1141     1141              

Impacted Files	Coverage Δ
terminusdb_client/woqlquery/woql_query.py	50.96% <50.00%> (+0.28%)	⬆️
terminusdb_client/woql_type.py	81.48% <0.00%> (-1.24%)	⬇️

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[rrooij]

I'm generally more in favor of separate functions for different types, instead of checking the types in the function itself. Still approved because it is better than having no date function now.