Persist table view config settings for restore on vscode reload or after table view tab close

[RandomFractals]

Tabulator table persistence added in #22 doesn't work with localStorage in vscode electron app for some reason.

In order to save and load Tabulator table columns, sort, and filter changes, consider saving them per data file in extension context storage. See: https://code.visualstudio.com/api/extension-capabilities/common-capabilities#data-storage

Also, perhaps combining those data view settings in a single <dataFileName>.table.json could make it more manageable for the table view config save and restore on vscode reload, and opening that config for manual JSON table config edits and tabular data view reload.

[RandomFractals]

This is now implemented in #64 using webview state for open table views, saves and reloads table config settings on vscode reload.

As an enhancement to make table config more accessible and editable in plain .json doc, we'll add tabular.data.createTableViewConfig = true | false option and generate <dataFileName>.table.json alongside the actual data file to save and load customized table settings after table views are closed.

[RandomFractals]

This should do it for now. See new tabular.data.createTableViewConfig Setting:

More info in docs: https://github.com/RandomFractals/tabular-data-viewer#settings