fix: check confirmation for preconfirmed txns and add subsidy

[aloknerurkar]

Describe your changes

Previously if we consider transaction as preconfirmed, we dont wait to check for transaction being in the block. With this change we will always check for inclusion.

Because of the above change, we will have to consider PreConfirmed state as a step before confirmation. So when we return receipts, we will not proxy request if it is preconfirmed.

Also added logic to provide subsidy to bidders for initial testing.

Issue ticket number and link

Fixes # (issue)

Checklist before requesting a review

• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation