(rpc_server): Add block_height_checker and Fix Chunk Fetch Bug

[kobayurii]

1. Add block_height_checker

• Implemented a block_height_checker to ensure that non-existing blocks are not fetched. This improvement prevents unnecessary fetch attempts for blocks that do not exist, optimizing resource usage and reducing potential errors.

2. Fix Bug with Fetch Chunk

• Resolved a bug related to chunk fetching where the system was encountering issues with incomplete or incorrect chunk retrievals. This fix ensures that the chunk data is fetched correctly and reliably.

[kobayurii]

@race-of-sloths please, include my PR in the Race

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[khorolets]

I am not a fan of that huge nested if-else code block, but I can accept it

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🥁 Score it!

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@kobayurii Thank you for your contribution! Your pull request is now a part of the Race of Sloths!
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Current status: executed

Reviewer	Score
@race-of-sloths	1

Your contribution is much appreciated with a final score of 1!
You have received 11 (10 base + 5% lifetime bonus) Sloth points for this contribution

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