Automatically send email with G Suite calendar id invite to member on joining committee

One-sentence description

To prevent ourselves from explaining this over and over

Desired functionality

If a members joins a committee they will receive an email from Thalia stating 'hey you have joined committee x, fun times, here you also have the calendar stream for this committee'

Suggested implementation

Probably we will need to introduce a field in the active member group model that contains the id for their calendar. And then we can use that one to send an email to the new members