Add support for multiple ArXiv IDs

[carlinmack]

Roadmap

This PR: Add support for multiple ArXiv IDs (in progress)

#2340 : Add support for other identifiers (doi for now) and change name

#2342: Add new tool which allows users to query for most recent papers which will be sent to this tool for finding presence in Wikidata and creating Quickstatements (CC @Daniel-Mietchen)

PR I'd like to do if I can: Upgrading citations.js (haven't been able to figure out) and potentially contributing some stuff upstream

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Description

Please include a summary of the change, relevant motivation and context. If possible and applicable, include before and after screenshots and a URL where the changes can be seen.

Adds ability to submit multiple ArXiv IDs to the tool

Caveats

Please list anything which has been left out of this PR or which should be considered before this PR is accepted
Check any of the following which apply:

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

If you make changes to the Python code

• My code passes the tox check, I can receive warnings about tests, documentation or both

Testing

Please describe the tests that you ran to verify your changes. Provide instructions, so we can reproduce. Please also list any relevant details for your test configuration.

• Tested with IDs which and found and not found (none, single and multiple)
• Added a warning if there is an exception/no quickstatements are generated

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)

[fnielsen]

Resolved conflicts and further edits. Carried to a new PR #2372 due to the complexity of resolving conflicts.