osd/OSD: reply pg_created when pg is peered

osd/OSD: reply pg_created when pg is peered

Problem:
  when PG is active+clean
  ceph osd force-create-pg 1.0 --yes-i-really-mean-it
  because osd is not reply pg_created to mon.
Affects:
  pool remains creating flags,
  mon creating_pgs.pg is not empty,
  lead to mon cannot trim OSDMaps
Solution:
  add PgCreateEvt for pg create
  if pg Active and is_peered,
  reply pg_created to mon.

Fixes: https://tracker.ceph.com/issues/63912
Signed-off-by: zhangjianwei2 <zhangjianwei2@cmss.chinamobile.com>