Fix dataframe (de)serialization#600

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ektar wants to merge 9 commits intoholoviz:mainfrom

ektar:fix-dataframe-serde

Commits on Feb 3, 2022

Add failing test with a dataframe that has datetimes in it
Carlson, Eric Thomas
committed
Add new dataframe ser/de implementations, tests pass
Carlson, Eric Thomas
committed
Add load from array test that breaks pandas
Carlson, Eric Thomas
committed
Fix operation for matrix-defined dataframes, allow dates to serialize to strings
Carlson, Eric Thomas
committed
Add verification of datetime serialization roundtrips to pandas test
Carlson, Eric Thomas
committed

Commits on Feb 4, 2022

Remove redundant "if" statement
Carlson, Eric Thomas
committed
Globally import json instead of inline
Carlson, Eric Thomas
committed

Commits on Apr 12, 2023