[portinglayer][ota] implement ota porting layer api

[step0035]

• matter sdk ota code should not call lower layer api
• implement portinglayer api for ota
• fix issue caused by long duration of flash erase
  • might get hardfault sometimes during long flash erase
  • blocking call might cause time-sensitive events such as matter subscription to timeout
• we fix this by storing the ota payload in a 4kb buffer (size of a sector is 4kb)
• once this buffer is filled up, erase the sector and write to that sector
• if ota abort (default ~10minutes timeout), a non-blocking background task will handle the flash erasure and self-delete afterwards.
• also rename core/matter_ota.cpp to core/matter_ota_initializer.cpp to avoid duplicate

[step0035]

wait for corresponding matter sdk update to merge first