Added formatting to values in DateTimeCell

[dikwickley]

Fixes #1889

It simply uses the formatter passed in DateTimeCell to parse the value & the searchValue so they are consistent.

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[pavish]

@dikwickley I'm closing this PR as the changes here break the functionality of DateTime cells. Please feel free to open a new PR when the issue is fixed.

[pavish]

@dikwickley This binding will break the entire functionality of this cell.

Try creating a Date & Time column in a table, and modifying the value in it. You'll notice that the cell no longer displays the value, in your PR.

Please refer the svelte docs on how bind works, and notice that there's already a prop called formatValue which is passed to the SteppedInputCell for the purpose of formatting content. Also when a change is made to a component, make sure to test all places that utilize it. In this scenario, this component is used as the cell in tables and explorations.