[FEATURE] Raise a specific error when no valid node is available during sending web3 request

[purplesmoke05]

Is your feature request related to a problem? Please describe.

• Currently, the implementation in web3_utils.py verifies the presence of a valid node before sending a Web3 request and sends the request to that node.
• If no valid node exists or if there is a valid node but the connection fails, the same error is raised.
• With this implementation, it is not possible for the API caller to distinguish when no valid node is available.

Describe the solution you'd like

• Raise a specific error when no valid node is available during sending web3 request , allowing the caller to distinguish these things.