handle columns definition in a better way than inspecting the keys of the first object

[todo]

an expensive way would be to reduce all objects' keys to a hashmap and use it for the columns (is there another way to do that ?)

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peritext-contextualizer-table/src/BlockStatic.js

Lines 12 to 17 in f80ede2

	* @todo handle columns definition in a better way than inspecting the keys of the first object
	* @body an expensive way would be to reduce all objects' keys to a hashmap and use it for the columns (is there another way to do that ?)
	*/
	const columns = Object.keys(data[0]).map(key => ({
	Header: key,
	accessor: key

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This issue was generated by todo based on a @todo comment in f80ede2. It's been assigned to @robindemourat because they committed the code.