Migrate all paths to bundler v2

[0xFirekeeper]

PR-Codex overview

This PR focuses on optimizing and cleaning up the code in the BundlerClient.cs and SmartWallet.cs files of the Thirdweb project. It improves the handling of user operations and the configuration of smart wallets, while also updating certain constants and methods for better functionality.

Detailed summary

• Simplified PMSponsorUserOperation method in BundlerClient.cs.
• Enhanced commented-out code for wallet creation examples in Program.cs.
• Updated PaymasterAddress in SmartWallet.cs.
• Unified bundler and paymaster URL assignments.
• Improved gas estimation logic in SignUserOp method.
• Refactored handling of paymaster data updates in SignUserOp.

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