[complete-doc]: add support for constuctor doc

[tanmoyopenroot]

PR checklist

• Addresses an existing issue: fixes completed-docs does not ask for constructor doc #4781
• enhancement
• Includes tests
• Documentation update

Overview of change:

Added new doctype => ARGUMENT_CONSTRUCTORS = "constructors"

Below is the descriptor

    public static ARGUMENT_DESCRIPTOR_CONSTRUCTOR = {
        properties: {
            [DESCRIPTOR_TAGS]: {
                properties: {
                    [TAGS_FOR_CONTENT]: {
                        items: {
                            type: "string",
                        },
                        type: "object",
                    },
                    [TAGS_FOR_EXISTENCE]: {
                        items: {
                            type: "string",
                        },
                        type: "array",
                    },
                },
            },
            [DESCRIPTOR_PRIVACIES]: {
                enum: [ALL, PRIVACY_PRIVATE, PRIVACY_PROTECTED, PRIVACY_PUBLIC],
                type: "string",
            },
            [DESCRIPTOR_OVERLOADS]: {
                type: "boolean",
            },
        },
        type: "object",
    };

[JoshuaKGoldberg]

Code changes generally LGTM, thanks for sticking to the existing styles! A few small comments here and there; the biggest thing is that protected is missing testing.

[tanmoyopenroot]

Code changes generally LGTM, thanks for sticking to the existing styles! A few small comments here and there; the biggest thing is that protected is missing testing.

Done

[JoshuaKGoldberg]

Cool, LGTM. Thanks!