Subbaddressing support exposed in urn:apache:james:params:jmap:mail:shares

[chibenwa]

Description

We need to have the front automatically detecting if the backend supports subaddressing.

We can modify urn:apache:james:params:jmap:mail:shares capability to add a supportsSubAddressing property (boolean)

"urn:apache:james:params:jmap:mail:share": {
  "supportsSubAddressing": true
}