Support BNB Smart Chain Bridging Routes

**Author(s):** Risk Labs **Status:** Proposed **Related Discussions:** [Discourse Forum](https://forum.across.to/t/support-bnb-smart-chain-bridging-routes/2055) --- ### Summary: Across proposes integrating Across with BNB Smart Chain. The Risk Labs’ team has been working to ensure the [new chain requirement](https://docs.across.to/resources/new-chain-requests) and technical feasibility (more below in the implementation section) regarding the implementation of the bridge adapters. Token(s):...