feat: Support v5 SDK format for signatureGenerate endpoints

[arcoraven]

Adds an experimental x-thirdweb-sdk-version flag to the signatureGenerate endpoints. This enables Engine to generate signature payloads compatible with thirdweb v5 SDK.

Tested these variations of generating a signature w/ Engine and signature minting with the thirdweb SDK:

• erc20, v4
• erc721, v4
• erc1155, v4
• erc20, v5
• erc721, v5
• erc1155, v5

---

v4 input:

{
  "to": "0xa5B8492D8223D255dB279C7c3ebdA34Be5eC9D85",
  "quantity": "1",
  "primarySaleRecipient": "0x0000000000000000000000000000000000000000",
  "currencyAddress": "0x0000000000000000000000000000000000000000",
  "mintStartTime": "1719367192000"
}

v4 output:

{
  "result": {
    "payload": {
      "to": "0xa5B8492D8223D255dB279C7c3ebdA34Be5eC9D85",
      "quantity": "1",
      "primarySaleRecipient": "0x0000000000000000000000000000000000000000",
      "uid": "0x3539323164373132376638623465383538663566303630363732613430356664",
      "currencyAddress": "0x0000000000000000000000000000000000000000",
      "price": "0",
      "mintStartTime": 1719367192,
      "mintEndTime": 2034727806
    },
    "signature": "0xea0372db75bd673bed3dfa23db34c5f8a15bb96ac8ce3e0b7093f642629b395c278a7f246f967ee2633279f77d17b5eaf747c7e4be3e89e9527dce500e7813561b"
  }
}

v5 input:

{
    "to": "0xa5B8492D8223D255dB279C7c3ebdA34Be5eC9D85",
    "validityStartTimestamp": "1719367192",
    "quantity": "2"
}

v5 output:

{
  "result": {
    "payload": {
      "to": "0xa5B8492D8223D255dB279C7c3ebdA34Be5eC9D85",
      "primarySaleRecipient": "0x4Ff9aa707AE1eAeb40E581DF2cf4e14AffcC553d",
      "quantity": "2000000000000000000",
      "price": "0",
      "currency": "0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
      "validityStartTimestamp": 1719367192,
      "validityEndTimestamp": 2034727648,
      "uid": "0x2036295f2d551adb572ad5aa721ea541b822baa487a50049354827d31c4cbd4d"
    },
    "signature": "0xcf299de9448d38d8ca8d98b163892611173be664f559bc6f6da60f663ba60c9b4286cc01a3b0f56cca8cc502956c018af37d3a8ac8ed8d54aa7724d837c5376e1c"
  }
}

---

PR-Codex overview

This PR updates schemas and adds support for v5 SDK in ERC20 contract signature generation.

Detailed summary

• Added thirdwebSdkVersionSchema for v5 SDK compatibility
• Updated schemas for ERC20 contract signature generation
• Implemented v5 SDK support in erc20SignatureGenerate handler

The following files were skipped due to too many changes: src/server/routes/contract/extensions/erc20/read/signatureGenerate.ts, src/server/routes/contract/extensions/erc721/read/signatureGenerate.ts, src/server/routes/contract/extensions/erc1155/read/signatureGenerate.ts

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