Bug 34828: Introduce Koha::MetadataExtractor and ->get_normalized_upc

Bug 34828: Introduce Koha::MetadataExtractor and ->get_normalized_upc

This patch introduces a new pattern for the different ->get_<thing>
methods we've been adding. The aim is that code will look more like:

my $metadata_extractor = Koha::MetadataExtractor->new;

while ( my $biblio = $biblios->next ) {
    my $record = $biblio->record;
    my $schema = $biblio->record_schema;

    $data->{$biblio->id}->{normalized_upc} =
$metadata_extractor->get_normalized_upc( { record => $record, schema =>
$schema } );
    $data->{$biblio->id}->{normalized_ean} =
$metadata_extractor->get_normalized_ean( { record => $record, schema =>
$schema } );
}

The key is that we are actually reusing the MARC::Record, and code for
each schema is organized cleanly so easier to maintain.

For the class names, I chose to add the 'MARC' name in the path, so we
don't need to refactor anything if we want to add support for another
serialization formats.

To test:
1. Apply this patch
2. Run:
   $ ktd --shell
  k$ qa -c 1
=> SUCCESS: Tests pass!
3. Sign off :-D

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>