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

[erthink]

@pmatilai, briefly **MDBX support 2 times longer keys than LMDB**.

In details:
 - the key size limit depends from the database page size.
 - for default (4K) pages MDBX now accepts keys up 1980 bytes (ie slightly less than half the page size).
 - but this value will soon be revised down to be slightly less than 1/3 of the page size.
 - MDBX allows you to set the page size when creating a database, ranging from 512 to 65536 bytes.

 So, MDBX allow significant large key sizes, including MAX_PATH (ie 4096) with corresponding size of database page.

P.S. Seems this should be added to the "list of Improvements over LMDB".

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