Pluggable transfer types for record files.

[mesemus]

Description

This pull request proposes refactoring of Invenio’s file transfer mechanism by making transfer types pluggable, moving beyond the existing fixed options (Local, Fetch, Remote). It also introduces a dedicated transfer field to contain all transfer-related metadata.

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.
• I've added relevant documentation.
• I've marked translation strings.
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[mesemus]

Note: This pull request was originally proposed at inveniosoftware/rfcs#76 and has been relocated here to allow additional contributions from the CESNET team.

[mesemus]

Connected pull requests:

Implementation in invenio-records-resources
S3 multipart implementation
invenio-rdm-records
docs-invenio-rdm