Adding attribute field for Testnets

[DefiDebauchery]

While it can often be inferred by the name, having a dedicated attribute for testnet would be of great use for filtering.

I don't have a problem doing the legwork of adding them, but wanted to get feedback on whether such a PR would be accepted.

[ligi]

I am not really sure about this tbh. What defines a "testnet"? I think you can also kinda deduct it from having a faucet. I would say: If there is at least one faucet then it is a testnet. Is there a reason/case this approach would not work for you?

[DefiDebauchery]

Pedantically, you used to be able to get faucets on Eth Mainnet, as well as Fantom, so I'm not totally sure that's a good metric.

I feel like testnets are pretty fairly defined, though - they represent a non-production playground for a blockchain ecosystem. Chainlist does seem to categorize these, which is potentially on name alone (I haven't looked), but not sure that's as much of a foolproof way of determining than a specific attribute would be.

[github-actions[bot]]

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