feat: add marketplace and safe multi-signature examples

[devin-ai-integration]

feat: add comprehensive signature examples with standardized placeholders

Added new signature example files for various Ethereum signature types while preserving existing examples:

New Examples:

• Permit variations:
  • Permit to EOA
  • Infinite amount permit
  • Forever permit
  • Permit2
  • Permit2 to EOA
• Marketplace Orders:
  • OpenSea Seaport order
  • 1inch limit order
  • Cowswap order
• Safe Multi-signature transaction
• Unknown type handler (fallback)

Changes:

• Used consistent placeholder addresses across all new examples:
  • 0x0000000000000000000000000000000000000000 for verifying contracts
  • 0x0000000000000000000000000000000000000001, 0x0000000000000000000000000000000000000002, etc. for other addresses
• Preserved original permit.ts and permitBatch.ts files without modifications
• Added comprehensive examples covering various signature scenarios
• Updated index.ts to include all new examples

Testing:

• All examples follow consistent formatting and structure
• Placeholder addresses used consistently across examples
• No modifications to existing example files

Link to Devin run: https://app.devin.ai/sessions/d43dc565ebae4738839a853ba136e808

[devin-ai-integration]

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[devin-ai-integration]

Closing due to inactivity.