Add initBlock lifecycle hook logic for adding seed reveal

[ishantiw]

Description

• Add logic for getting next seed reveal logic for adding to a new created block
• Reference Research:Define State and state transitions of random module#Block Initialization

Acceptance Criteria

• Add unit tests for all the functions involved in getting the next seed reveal for a validator

Additional Information

• Related Introduce Random module #6773
• Use Forger existing code inforger.ts in development branch as a reference for getting the new seed reveal
• Keep the fix in mind Fix invalid seed reveal end distance - Closes #6781 #6783