Feature/msc2399

[BillCarsonFr]

Support for MSC 2399
matrix-org/matrix-spec-proposals#2399

• Instead of not sending key to a specific device, we will now send a to device event of type org.matrix.room_key.withheld with a reason code (blacklisted, unverified, no olm (otk)..)
• Added a new di module that allows to inject an http interceptor. This is used for test, it enables to catch and reply to specific requests:

 aliceInterceptor!!.addRule(MockOkHttpInterceptor.SimpleRule(
                "/keys/claim",
                200,
                """
                   { "one_time_keys" : {} } 
                """
        ))

• includes some enhancement to SDK:

  • The shared session info is now persisted SharedSessionEntity, instead of only kept in memory
  • Events from the sync (exluding initial sync) are decypted on the fly (RoomSyncHandler#249)

• Key withheld event will also be sent back when a key share request is received

Contains also a new lab setting, to change for error display

• basic collapsing of consecutive UTD, with user friendly message