Merge from vendor branch TNF:

Merge from vendor branch TNF:
Initial import of converters/p5-MARC-Charset version 1.2
This package was submited as part of PR pkg/43929 which adds the Koha Integrated Library System
submitted by Edgar Fuß

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MARC::Charset allows you to turn MARC-8 encoded strings into UTF-8 strings.
MARC-8 is a single byte character encoding that predates unicode, and allows
you to put non-Roman scripts in MARC bibliographic records.