Add support for JSON and YAML chain and token configs

[jmrossy]

Fixes https://github.com/hyperlane-xyz/issues/issues/732

• Add support for JSON and YAML chain and token configs
• Update some stale docs
• Cleanup default chain and token const files

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Name	Status	Preview	Comments	Updated (UTC)
hyperlane-warp-template	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 5, 2023 3:52pm

[avious00]

thanks for adding the additional comments at the top of the snippets in /chains.yaml + /chains.ts