Add support for the xDai chain and the XDAI token

[leafcutterant]

This is a feature request to include XDAI in BRD.

The xDai chain is a proof-of-stake layer-2 network on top of Ethereum. It is currently permissioned and validated by reputable Ethereum projects, but it's moving toward permissionlessness. Its native token, the XDAI is backed 1:1 with the DAI stablecoin. XDAI can be turned into DAI and back through a token bridge contract operated by the xDai chain validators. This way, just like with DAI, every XDAI is also soft-pegged to the USD. This network is special because its native token is a stablecoin, and fees are also paid in this same token, doing away with the UX pain of needing ETH to transact DAI. The consensus mechanism also offers quick confirmations (5 sec block time) and low fees (sub-cent).

These make XDAI a good fit for everyday stablecoin payments and mass adoption while we wait for Ethereum to become scalable and for a native meta transaction standard to settle on.

Thanks for considering supporting it!

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[DrewCarlson]

Thanks for the detailed request. This is not currently a priority but we will take it into consideration.