[Feature Request] Link E-mail with a task

Expected behaviour

It should be possible to link a task with an e-mail

This is not the same as #128 because I don't want to send email somewhere to be converted to a task, I want to simply link a task to a mail in the mail app, so that when doing a task I could check the relevant information associated to a task that might be in an e-mail. So someone sends you an email and that someone requests you todo something, then you create a task in the Tasks app and link it to the e-mail that has more information. You could copy e-mail content to the notes of the task, but you might lose formatting, or the e-mail could be a long one and the existing notes box is not really suited for that, so the best solution would be a link to an e-mail which if pressed would open relevant e-mail in mail app.

Start by reviewing how the Tasks app stores tasks and renders task details, then investigate how the mail app exposes links that open a specific message. Define the integration and persistence needed so a task can retain an email link and open the relevant message; the issue provides no named files or tests.