delimiters support for hash

[rolandettema]

The current delimiters supported in the dropdown for table view of CSV are commas, semicolons, tab and pipe. Is there interest in supporting hash (#) delimitation?

[jasongrout]

If you see files like this, feel free to add it. I didn't have it in there because I've never seen that delimiter in the wild.

The code is at

jupyterlab/packages/csvviewer/src/toolbar.ts

Lines 14 to 22 in 52b871d

	/**
	* The supported parsing delimiters.
	*/
	const DELIMITERS = [',', ';', '\t', '|'];
	/**
	* The labels for each delimiter as they appear in the dropdown menu.
	*/
	const LABELS = [',', ';', 'tab', 'pipe'];

[jasongrout]

(just curious, where do you see files with hash delimiters?)