fix: return 400 for client-side errors for send-signed-transaction

[arcoraven]

Changes

• Improved error handling in the sendSignedTransaction endpoint to better handle client-side errors
• Added specific handling for insufficient funds errors, returning a 400 status code with a clearer error message
• Imported necessary utilities from the error handling module

How this PR will be tested

• Send a signed transaction with insufficient funds. Result: Should receive a 400 status code with a "CLIENT_RPC_ERROR" error type and a clear error message.
• Send a valid signed transaction. Result: Should receive a 200 status code with the transaction hash in the response.
• Send a transaction that fails for a non-client reason. Result: Should receive the appropriate error status code.

Output

curl -X POST /transaction/blockchain/send-signed-tx \
  -H "Content-Type: application/json" \
  -d '{"signedTransaction": "0x...", "chainId": 1}' \
  -v

For insufficient funds:

HTTP/1.1 400 Bad Request
{
  "error": "CLIENT_RPC_ERROR",
  "message": "Insufficient funds for gas * price + value"
}

---

PR-Codex overview

This PR enhances the send-signed-tx.ts file by adding error handling for insufficient funds when sending a signed transaction. It introduces a new error handling mechanism that returns a 400 status code for client errors.

Detailed summary

• Added Hex type import from thirdweb.
• Introduced isInsufficientFundsError and prettifyError imports for error handling.
• Wrapped the eth_sendRawTransaction call in a try-catch block.
• Implemented custom error handling for insufficient funds, returning a 400 status code.

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[arcoraven]

• fix: return 400 for client-side errors for send-signed-transaction #892 👈 (View in Graphite)
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