feat: Engine Tiers

[arcoraven]

Add Engine tiers selection when adding an Engine instance.

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PR-Codex overview

This PR updates the Engine UI components, adds EngineTier types, and refactors the CreateEngineInstanceButton.

Detailed summary

• Added EngineTier type for engine instances
• Updated UI components in EngineNoConnectedWallet
• Refactored CreateEngineInstanceButton logic for tier selection
• Added modal for choosing Engine deployment tier with pricing and features
• Introduced EngineTierCard component for displaying tier information

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Name	Status	Preview	Comments	Updated (UTC)
thirdweb-www	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 7, 2024 5:44pm

[jnsdls]

todo UI changes from testjam (on my plate)