add build_mainnet for easy use sui-sdk

[lispking]

Description

This PR adds a new function build_mainnet corresponding to the mainnet RPC node for the SuiClientBuilder type.

Test plan

How did you test the new or updated feature?

let sui_mainnet = SuiClientBuilder::default().build_mainnet().await?;
println!("Sui mainnet version: {}", sui_mainnet.api_version());

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Release notes

Check each box that your changes affect. If none of the boxes relate to your changes, release notes aren't required.

For each box you select, include information after the relevant heading that describes the impact of your changes that a user might notice and any actions they must take to implement updates.

• Protocol:
• Nodes (Validators and Full nodes):
• Indexer:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK: Added a build_mainnet function to the SuiClientBuilder.
• REST API:

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Name	Status	Preview	Comments	Updated (UTC)
sui-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 17, 2024 3:34am

3 Skipped Deployments

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multisig-toolkit	⬜️ Ignored (Inspect)	Visit Preview		Dec 17, 2024 3:34am
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[stefan-mysten]

Thanks @lispking