Fix wrong ABNF Message construction

[jaeil-wiki]

fix wrong ABNF message format construction on createSiweMessage in src/utils/siwe/createSiweMessage.ts.

• The Issue is missing LF between prefix and suffix when constructing without statement argument.
  refs: https://eips.ethereum.org/EIPS/eip-4361
• Please consider prefixRegex in parseSiweMessage.ts:L50 pattern is still correct. (It looks good to me 🤔 )

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PR-Codex overview

This PR updates the createSiweMessage function to improve the message format and adds missing newline characters for better readability.

Detailed summary

• Updated createSiweMessage statement construction to match ABNF Message Format
• Added missing newline character in prefix for better message formatting

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Latest commit: 319f0db

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