Add a Network column

[willhennessy]

With Layer 2 networks now live, an increasing number of token lists now support tokens from multiple chains. As such, the token list page (ex) should add a column for Network.

The network column should list the human-readable name of the network rather than the raw chain ID number.

• Ethereum
• Kovan
• Rinkeby
• Ropsten
• Optimistic Ethereum
• Arbitrum One
• Polygon
• etc. If a name is not known, we can fall back to showing the chain ID number

mock:

[guo]

It is possible to integrate with https://github.com/ethereum-lists/chains to show all chains.

Also, the address hyperlink can be the explorer link of different chains.