Large default transaction polling time for waiting txn result in EVM chains

[bcsainju]

Describe the bug
The current default polling time which is set to 30s by default causes delay in getting the confirmation of the transaction in the EVM chain. The current implementation uses 30s default polling time which means if the initial check for transaction status is not success, it will try again only after 30s for 15 times.

Expected behavior
The delay should be configured smaller but with more polling attempt so that we get notified earlier than to wait for 30s.