Fix caching#985

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notmandatory wants to merge 2 commits intobitcoindevkit:release/0.28from

notmandatory:fix_caching

Commits on Aug 4, 2023

Fix address caching, start from last cached index instead of always 0
notmandatory
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Fix ensure_addresses_cached, cache addresses from last_index to last_index + max_addresses
notmandatory
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