[Rpm-maint] [rpm-software-management/rpm] RFE: Offer MDBX as an alternative engine to LMDB for rpmdb (#958)

[erthink]

MDBX (i.e. [libmdbx](https://github.com/leo-yuriev/libmdbx)) is superior to LMDB with set of additional features ([the list](https://github.com/leo-yuriev/libmdbx#improvements-over-lmdb)). For rpmdb most useful are:
1. Automatic on-the-fly database size control by preset parameters, both reduction and increment.
2. Automatic continuous zero-overhead database compactification.
3. mdbx_chk tool for database integrity check.
4. LIFO policy for recycling a Garbage Collection items (on systems with a disk write-back cache, this can significantly increase write performance, up to several times in a best case scenario).
5. bundled test suite.

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