Support additional blockchains

**Is your feature request related to a problem? Please describe.**
The user cannot use Ethereum in the Beet wallet

**Describe the solution you'd like**
Support Ethereum & other targeted high value/credibility blockchains

**Describe alternatives you've considered**
Not supporting these blockchains.

**Additional context**
Several of the higher mcap blockchains have substantial funding/grants which we could use to continue Beet development with.

Ethereum funding options:
* https://opengrants.com/grant/0xc7258e550d58d585b85e96536540390279b81f3b
* https://esp.ethereum.foundation
* https://consensys.net/grants/

We support Steem but we don't support Hive yet. They're very similar technologically, hive being more actively supported by devs. There's a proposal system too which we could apply to: https://developers.hive.io/services/dhf.html

Ethereum classic funding options: https://www.coindesk.com/business/2022/07/26/antpool-supports-ethereum-classic-ecosystem-with-10m-investment/

Polkadot funding:
github.com/w3f/Grants-Program
https://medium.com/polkadot-news/polkadot-ecosystem-grant-programs-968d11d9c49e

No files, tests, or entry points are named. Start by reviewing the existing Steem support and defining which blockchain integrations are actually in scope among Ethereum, Hive, Ethereum Classic, and Polkadot. Done would require an agreed target scope and verified support for the selected chains.

Written by the indexing model from the issue text.