#1044 implement user column type

[florentinap]

This PR adds a new column type: User. It allows user to add a reference to another active user in organization. A list of available user names is displayed as suggestions.

[fflorent]

[comment that you may dismiss, I am a bit nitpicking]

In a more functional way, you may use Array#flatMap instead:

Suggested change

	for (const user of res) {
	const fullUser = this.makeFullUser(user);
	if (![...NON_LOGIN_EMAILS, SUPPORT_EMAIL].includes(fullUser.email)) {
	users.push({
	...fullUser,
	access: null
	});
	}
	}
	const users: UserAccessData[] = res.flatMap((user) => {
	const fullUser = this.makeFullUser(user);
	return [...NON_LOGIN_EMAILS, SUPPORT_EMAIL].includes(fullUser.email)) ? [] : [{
	...fullUser,
	access: null,
	}];
	});

[fflorent]

I wonder if that would not be a security issue, considering that it would expose the list of every users of an instance (their name and their email), no matter what access to their information the requester have.

[florentinap]

In my use case, I control all users in the instance, so there is no problem. You know more use cases, so you know if there is one that listing all users might be a security issue. Do you think it would be better to list only users who have access to the current site?