Drop range-v3 and replace it with `std::ranges`

[christianparpart]

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We want to reduce external dependencies and embrace standards.

C++20 comes with its own <ranges> library, so there is no need to depend on range-v3 library anymore.

Most places should be trivial to adapt. If any first-time contributor comes across this ticket, don't hesitate to talk to us on Discord, so we can help you getting on board and guide you through.