Add support for linea_estimateGas

[phoax]

Linea, a layer 2 blockchain, supports the Ethereum EIP-1559 gas price model, known for making transaction fees more predictable. Unlike the base Ethereum layer, Linea aims to offer a more stable and cost-effective approach to handling transaction fees. For detailed information, you can visit Linea's Gas Fees Documentation.

To further enhance the efficiency of transaction fee calculations, Linea has introduced a new RPC method designed to provide the best gas price estimates. This new method is documented in detail here.

The introduction of this new RPC method necessitates changes in how web3 libraries calculate gas prices. Traditionally, these libraries used the eth_gasPrice method. Linea's update shifts this approach to utilize the newly introduced linea_estimateGas method.

Detailed summary

• Added linea_estimateGas plugin to calculate accurate gas price on Linea network
• Updated getFeeData to pass the transaction data

[arthur-remy]

Hey @ricmoo,
Do you have a rough idea when this PR might be reviewed? This would be super useful for users to get cheaper gas price on Linea.
If there's anything we can do to make the review smoother, just let us know. Happy to help out!
Thanks a lot for your time, and for the awesome work you do with ethers.js

[wantedsystem]

Hi @ricmoo,

I hope you're doing well. I wanted to kindly follow up on our PR regarding the gas price optimization for Linea users. We believe this feature could significantly benefit ethers.js users by facilitating cheaper gas prices.

If there's any additional information or adjustments needed to streamline the review process, please let us know. We're eager to contribute and make any necessary changes to align with the project's standards.

Thank you for your time and the amazing work you do with ethers.js. Looking forward to your feedback