WIP SSED fixes GSDK 4.3.2

[suveshpratapa]

• Build SSEDs with OPENTHREAD_CONFIG_CHILD_SUPERVISION_CHECK_TIMEOUT=0 1.3.1 optional feature which detaches sleepy devices if they don't hear from their parent within 190 seconds -- this feature is still under discussion and not relevant for our SSED examples. Also, it's optional.
• Increased default CSL uncertainty on SSED devices. Default is 12 (120 us.), increased to 200 (2000 us. = 2ms.) to account for large fragmented packets that maybe exchanged with SSEDs in Matter examples.
• enable_sleepy_device=true gn config seems to be deprecated. Replaced with chip_enable_icd_server=true

[suveshpratapa]

cc @mkardous-silabs