[Spaces] SDK: Support Space room type

[SBiOSoftWhare]

Support MSC1772

TODO:

• Create a Space Service (MXSpaceService)
  • Create public space
  • Create private space
  • Get Space from Id
  • Delete Space from id
  • Query space children through space summary API
  • Get space summaries
  • Get root space summaries
  • Join Space
  • Peek space
  • Reject invite
  • Get flatten orphan rooms
  • Get flatten space children
  • Get flatten parent spaces (pre calculate after each sync or filter at last moment)
  • Set space parent
  • Support space summary API
• Space summary (Using and extending MXRoomSummary at the moment)
  • Create a MXSpaceSummaryUpdater or reuse MXRoomSummaryUpdater (Reuse MXRoomSummaryUpdater atm)
  • Check parent and child relationship in the space summary updater when a new a child space arrives
  • Add space parents property
  • Add child infos property
  • Add flatten parent Ids property
• Space Model (MXSpace)
  • Room management
    • Add room to space
    • Remove room
  • Parent/child management
    • Add subspace
    • Remove child space
    • Get child order
• Support room type (messaging / space)

Note: Do not handle auto join rooms. Suggested rooms has been introduced.

[gileluard]

All done so far except Set children order but root spaces order is synced with web.