Exclude the ADB hashmaps from ADB overmem accounting

Merged Ondřej Surý requested to merge 3739-adb-cleans-overzealously-under-memory-pressure into main

The ADB overmem accounting would include the memory used by hashtables thus vastly reducing the space that can be used for ADB names and entries when the hashtables would grow. Create own memory context for the ADB names and entries hash tables.

Closes #3739 (closed)

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