Publisher field

[keegansmith21]

• Added ONIX Publishers field to the book product table. Currently contains an array of PublisherName and PublishingRole for each product
• Updated export tables to include the aforementioned PublisherName field (as publisher_name) where the PublishingRole is "Publisher" (same as onix publishingrole code 01)
• Updates the oapen metadata filter to not exclude the publisher ( ). This means that publisher information will now be supplied by oapen sources

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.72%. Comparing base (1898cf7) to head (e101631).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #217 +/- ## ======================================= Coverage 93.72% 93.72% ======================================= Files 14 14 Lines 2807 2807 Branches 353 353 ======================================= Hits 2631 2631 Misses 97 97 Partials 79 79 ```

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