JAMES-3945 IMAP & JMAP right management for sub addressing

[florentos17]

refs:

• wikipédia for Sub-addressing
• RFC5233 for subaddress extension
• the jira ticket

the first part of the work is done, now subaddressing works on the backend side, CF the first github issue and the associated PR

right positioning using IMAP, eg setting the p right for a specific folder for either no one or anyone, is also done, CF this PR

remains to be done: right positioning using JMAP. speaking to @chibenwa, we agreed to wait for front-end support before carrying on with that.

[tddang-linagora]

we agreed to wait for front-end support before carrying on with that.

@chibenwa In what aspect do you need front end support, so that an back end feature can be implemented after? Isn't it the other way around?

[chibenwa]

@chibenwa In what aspect do you need front end support, so that an back end feature can be implemented after? Isn't it the other way around?

Indeed there's a misunderstanding here.

I wish the backend do not deliver features that never gets exposed by the frontend but indeed adding backend support would be a prerequisite to frontend support.