Add tutorials on how to send transaction with gas limit more than half of space gas limit

[darwintree]

Describe the feature or improvement 描述新特性或改进

Conflux's consensus doesn't set restriction for transaction gas limit but the node implementation sets a limit for the xxx_estimate interface.

This is because the Conflux's adaption of 1559 implementation, which means that a transaction more than half of block gas limit will definitely increase the base fee for the current block so such transaction might be never packed if its base fee is set to the minimum basefee.

However, a transaction with such gas limit can be sent via xxx_sendRawTransaction with correct basefee/gas price setting.

Optional: Affected page(s) or section(s) 受影响的页面

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Optional: Why is this feature or improvement important? 为什么需要这个新特性或改进？

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Optional: Implementation ideas 如何实现

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Optional: Additional context 其他上下文信息

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Contribution Confirmation

• I'd be willing to contribute this feature myself within 2 months. 我将在两个月内自己实现这个feature