[IMP] gamification : add ranks based on karma

To encourage forum and slides users to be more active ranks are now added.
They are directly linked to karma. The more the user has karma the more his
rank will be high.

The default rank is Newbie, with 1 point of karma. Users with 0 karma are
considered as inactive on forum or slides. When a user reach a new rank
a mail is sent to him to congratulate him with his new rank.

To add a button in the mail template to allow users to go directly on
a website section (like forum or slides) simply override
get_gamification_redirection_data to add the target url.

Partial commit linked to eLearning project. Main specifications related
to gamification and user profile can be found on task 1922159 (PR #30514).
Main specifications related to eLearning can be found on task 1902304
(PR #29876).

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