feat: gas estimates

[joepegler]

Gas estimates for userOps

const amountInWei = await smartAccount.getGasEstimates([tx, tx], {
  paymasterServiceData: {
    mode: PaymasterMode.SPONSORED,
  },
});

Checklist:

• [x] I have performed a self-review of my own code.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [X] I have made corresponding changes to the documentation, if applicable.
• [x] My changes generate no new warnings or errors.

---

PR-Codex overview

The focus of this PR is to enhance error handling in HTTP requests and improve gas estimation for user operations.

Detailed summary

• Improved error handling in HTTP requests with additional status and service information
• Added a new method for gas estimation in user operations
• Updated Paymaster class with a new mode constant and added a new token constant
• Updated test cases for gas estimation and error handling
• Fixed typos in comments and URLs in the code

The following files were skipped due to too many changes: src/account/BiconomySmartAccountV2.ts

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[github-actions[bot]]

size-limit report 📦

Path	Size
core (esm)	51.97 KB (+0.23% 🔺)
core (cjs)	56.55 KB (+0.26% 🔺)
account (tree-shaking)	50.91 KB (+0.15% 🔺)
bundler (tree-shaking)	2.33 KB (+0.85% 🔺)
paymaster (tree-shaking)	2.25 KB (+1.28% 🔺)
modules (tree-shaking)	40.05 KB (0%)