refactor(ui): support custom file display name resolver

[zubeydecivelek]

closes CERNDocumentServer/cds-rdm#652

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Description

• This change allows the file names shown on the record page to be customized by passing a small resolver function to the file UI macros.

• Instead of always displaying the file key, instances can customize how the file name should be derived (for example: using file.metadata.title instead of file.key).

• New blocks added to make customization of the file name for preview box and files list, without overriding the record_files block.

See CDS-RDM override: CERNDocumentServer/cds-rdm#655

Checklist

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• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
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• I've followed the CSS/JS and React guidelines.
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• I've followed the user interface guidelines.

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