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Draft: Move the lowercase part in rdataset_getownercase() out of the rdlock

Ondřej Surý requested to merge 3811-reduce-lock-contention-in-the-qpzone into main

Create a local copy of header->upper, so we can unlock the node when doing dns_name 0x20 manipulation. This shortens the time the read lock on the nodelock is held, reducing the lock contention between threads.

Closes #3811

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