[ARFC] Onboard USDai & sUSDai to Aave V3 Arbitrum Instance

After new events about USDai and sUSDai, and the Strategic partnership that protects USDai holders through Munich Re-backed coverage (https://x.com/usdai_official/status/2019806893682966804?s=46&t=_WsUi1np5oVUM3T08vcXkQ) ACI is reopening the thread to reassess the onboarding of USDai and sUSDai and invites as well Risk Service Providers and the community to give their feedback.