pulibrary / bibdata / 65789b12-710e-4384-8888-0140a5099044

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main: 91%

Pull #3363

circleci

Migrate scale_display field to Rust

This commit introduces a macro extract_marc! that works
similarly to the extract_marc method in traject.

In traject, you might write:

```
extract_marc('255b:342a')
```

With this macro, you can achieve a similar effect with:

```
extract_marc!("255b", "342a")(record)
```

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