create legacyIdPrefix parameter for maps and UUIDs

Merging multiple systems can involve overlapping identifier values and issues combining map files requiring preprocessing and awkward procedures

Propose legacyIdPrefix parameter for main config (ideally overwritable at the file level) that would be prepended to legacyId before generating UUID and hrid. The prefix should affect only the map, UUID, and hrid so remapping the value itself is unnecessary. This functionality is needed most for instance and holdings maps but may have other applications such as orders or anything that creates deterministic uuids.

Example:

legacyIdPrefix = myprefix
legacyBibId = b1234567

instance map = ["myprefixb1234567", "40785bac-f500-49f0-8aba-2bb19c04eeed", "inmyprefix0000000001"]