[feat] implement block_hash function

[Gerson2102]

• [#40] issue #
• [X] follows contribution guide
• [X] code change includes tests

Adding the block hash function implementation. Function tested.

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Name	Status	Preview	Comments	Updated (UTC)
raito	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 28, 2024 8:41pm

[Jeanmichel7]

last check should be ok after #103

[m-kus]

@Gerson2102 please rebase and fix the tests, it should be ok now as #103 is merged