PI support and theme updates

[jmrossy]

Fixes https://github.com/hyperlane-xyz/hyperlane-monorepo/issues/1807 Pre-req for https://github.com/hyperlane-xyz/hyperlane-monorepo/issues/1913

• Add PI support for configuring and searching custom chains
• Update SDK 1.2.1 and use latest metadata schema
• Use MultiProvider for provider / chain metadata management
• Update theme colors
• Create tests for PI chain searching
• Improve ChainLogo component

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Name	Status	Preview	Comments	Updated
hyperlane-explorer	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 9, 2023 at 1:09PM (UTC)