[REF,IMP] project,project_issue,rating: Handle ratings more efficiently

Purpose:

For our internal project management, we would like to track the customer
satisfaction on the open projects. We send them an email every one or 2
weeks allowing them to give a feedback by clicking on one of 3
smileys: Happy, Average, Angry. They can also put a additional explanation.

We already have something similar which is working on livechat with a
unusable reporting, and on issues but unusable. Our project are managed by tasks.

Specification:
- On the project : Selection fields : (Periodical Rating or Rating on Stage)
  + Fields to choose the period if periodical
- On the stage : email_template_id field.
- IF :
---> Periodical : Send an email to all the customers for the tasks on this stage periodically
---> On Stage : Send an email to the customer's tasks when the task reaches the stage
- That way, it's impossible to send a satisfaction request both periodically and sequentially.
  FP request
- Who is the customer : The customer on the task OR the customer on the related sales order
  OR the customer on the projet OR nobody
- The last feedback is displayed on the task kanban card (Thumb up, down, or neutral)
- On the project kanban card, the customer satisfaction is displayed. This is the simple
  mean of all the previous ratings.

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