D27860: [server] Add some sub-surface life cycle signals

[Vlad Zahorodnii]

zzag added a dependency: D27859: [server] Expose SurfaceRole class.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D27860

To: zzag, #kwin
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns