fix: ST-56 increase default max fee per gas

[a00012025]

改了預設 max fee per gas 的算法，多乘以 1.1 來確保交易不會因為 max fee 太低而失敗

[kryptogoreviewer]

PR Analysis

• 🎯 Main theme: 修復：ST-56 增加預設的最大每單位氣體費用
• 📌 Type of PR: Bug fix
• 🧪 Relevant tests added: No
• ✨ Focused PR: Yes, 此PR專注於調整最大每單位氣體費用的計算方式。
• 🔒 Security concerns: No

PR Feedback

• General suggestions: 此PR的主要目的是調整最大每單位氣體費用的計算方式，這是一個重要的修復。然而，我建議添加相關的測試來驗證這個變更是否符合預期。

• 🤖 Code feedback:

  • relevant file: lib/src/core/transaction_signer.dart
    suggestion: 重要：請考慮使用一個常數來表示這個2.2的倍數，這樣可以提高代碼的可讀性和可維護性。
    relevant line: (baseFeePerGas.getInWei * BigInt.from(220) ~/ BigInt.from(100)) + maxPriorityFeePerGas,

  • relevant file: lib/src/core/transaction_signer.dart
    suggestion: 中等：請考慮將這個計算最大每單位氣體費用的邏輯封裝到一個單獨的函數中，這樣可以提高代碼的模組化。
    relevant line: (baseFeePerGas.getInWei * BigInt.from(220) ~/ BigInt.from(100)) + maxPriorityFeePerGas,

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