pulibrary / bibdata / 82611eb9-67ec-4a2f-80a4-fd7469136476

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Refactor: use extract_field_values_by as a method rather than a function (#3103)

I think it's a little more ergonomic as a method. That way, we
can say:

```
record.extract_field_values_by(|field| field.tag == '500', join_all_subfields)
```

rather than:

```
extract_field_values_by(record, |field| field.tag == '500', join_all_subfields)
```

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