Fixed the issue by updating esp-idf to main branch and enabling "Persist the BLE bonding keys in nvs".

Hi! After spending 2 days trying to figure out how to make Nimble save bound devices to NVS flash, I couldn't find relevant information - only "Not yet implemented" from 5 years ago. I've been mostly using the bleprph example as a reference. Does anyone have example code on how to save bound devices...