feat: PRT - cache block hash storage

[ranlavanet]

Description

Closes: #XXXX

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Author Checklist

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I have...

• [ ] read the contribution guide
• [ ] included the correct type prefix in the PR title, you can find examples of the prefixes below:
• [ ] confirmed ! in the type prefix if API or client breaking change
• [ ] targeted the main branch
• [ ] provided a link to the relevant issue or specification
• [ ] reviewed "Files changed" and left comments if necessary
• [ ] included the necessary unit and integration tests
• [ ] updated the relevant documentation or specification, including comments for documenting Go code
• [ ] confirmed all CI checks have passed

Reviewers Checklist

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I have...

• [ ] confirmed the correct type prefix in the PR title
• [ ] confirmed all author checklist items have been addressed
• [ ] reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage

[github-actions[bot]]

Test Results

2 173 tests  +764   2 173 :white_check_mark: +764   25m 53s :stopwatch: + 3m 26s   144 suites + 37       0 :zzz: ±  0      7 files   +  1       0 :x: ±  0 

Results for commit 0f283d44. ± Comparison against base commit bc2e0850.

:recycle: This comment has been updated with latest results.