In Assets list group by tokens instead of blockchain

Innovative blockchains have been increasingly arising, so tokens are becoming multi-blockchain, and token holders have a choice of which blockchains they want their tokens on.

Withdrawal pages on centralized exchanges often provide a list of many blockchain options:



Tether lists some of the blockchains that USDT officially exists on at [Supported Protocols and Integration Guidelines](https://tether.to/es/supported-protocols).
e.g.:
Ethereum: https://etherscan.io/token/0xdac17f958d2ee523a2206206994597c13d831ec7
Avalanche: https://snowtrace.io/token/0x9702230a8ea53601f5cd2dc00fdbc13d4df4a8c7
Polygon: https://polygonscan.com/address/0x170a18b9190669cda08965562745a323c907e5ec
Kava: https://explorer.kava.io/address/0x919C1c267BC06a7039e03fcc2eF738525769109c
Tron: https://tronscan.org/#/token20/TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t
EOS: https://bloks.io/account/tethertether

A wallet may hold various quantities of a token on multiple blockchains. Currently, AlphaWallet would show each in separate rows, in sections separated by blockchain.

It'd make more sense to list a token only once in the Assets list, and then show how much of the token is held on each blockchain, and then maybe a total quantity across all enabled blockchains. i.e. group by logical token instead of by blockhain.