Adds config for base networks on testing and prod.

[steven2308]

Checklist

• Verified code additions
• Updated NatSpec comments (if applicable)
• Regenerated docs
• Ran prettier
• Added tests to fully cover the changes

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PR-Codex overview

Focus of the PR:

This PR focuses on updating the environment variables and network configurations.

Detailed summary:

• Updated the SEPOLIA_URL, ETHEREUM_URL, POLYGON_URL, MUMBAI_URL, BASE_URL, BASE_GOERLI_URL, PRIVATE_KEY, MOONRIVER_MOONSCAN_APIKEY, MOONBEAM_MOONSCAN_APIKEY, POLYGONSCAN_API_KEY, and BASE_API_KEY environment variables in the .env.example file.
• Changed the runs value in the optimizer section of the hardhat.config.ts file from 200 to 100.
• Modified the network configurations in the hardhat.config.ts file:
  • Updated the gasPrice value for the moonbaseAlpha network.
  • Added the allowUnlimitedContractSize option for the hardhat network.
  • Updated the gasPrice value for the moonriver network.
  • Updated the gasPrice value for the mainnet network.
  • Updated the gasPrice value for the polygon network.
  • Added the base and baseGoerli networks with their respective configurations.
• Updated the apiKey values for the etherscan section in the hardhat.config.ts file.
• Added custom chain configurations for the baseGoerli and base networks in the etherscan section.

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[ThunderDeliverer]

🚀

[ThunderDeliverer]

Let's fill these out with examples as well (like you did for Sepolia and Ethereum) 🤔