Use that instead of the half-baked Adaptive Radix Tree
implementation. ART would probably be better in the long run, but more
complicated to implement.
You still need to provide a max size up-front, but memory is only
allocated for the portion that is in use.
The module is currently unused, but will be used by the new compute
communicator project, in the neon Postgres extension. See
https://github.com/neondatabase/neon/issues/11729
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Co-authored-by: Erik Grinaker <erik@neon.tech>
