Implement `Send`/`Sync` for all `vk` structs#869

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MarijnS95 merged 2 commits intoash-rs:masterfrom Neo-Zhixing:send-sync

Mar 24, 2024

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Commits on Mar 24, 2024

Squashed commit of the following:
Marijn Suijten
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Add changelog entry
Marijn Suijten
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