Impl adjust difficulty

[Jeanmichel7]

• [x] issue #8
• [x] follows contribution guide
• [x] code change includes tests

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Name	Status	Preview	Comments	Updated (UTC)
raito	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 24, 2024 8:14pm

[m-kus]

Can you please also enable epoch/target checks in the test_block170 ?