doi field is now case insensitive

[Akshat30]

Before merging:

• [x] Have you checked the diffs (of new code) for stray console logs, and removed them?
• [x] Have you checked the diffs (of new code) for un-used imports and comments, and removed them?
• [x] Have you tested edge cases that you have thought of? (when the variable is undefined, invalid TYPE, when there are many items in an array, when there are very few)

Issue

Before, when the doi field was case sensitive, part of the output for a given paper with the link associated with doi instead of DOI in the id_object.json file was as follows:

"access": [
            {
                "access": "public",
                "url": "https://doi.org/10.1145/3618257.3624838",
                "type": "doi"
            },
            {
                "access": "public",
                "url": "https://www.caida.org/catalog/papers/2023_coarse_grained_inference_bgp/coarse_grained_inference_bgp.pdf",
                "type": "PDF"
            }
        ],

The doi associated url should be its own field outside of the access array.

Fix

After making the script check for DOI regardless of case (using .upper() method), the output for a given paper, where the doi field is not fully uppercase, was correct:

"doi": "https://doi.org/10.1145/3618257.3624838",
"access": [
    {
        "access": "public",
        "url": "https://www.caida.org/catalog/papers/2023_coarse_grained_inference_bgp/coarse_grained_inference_bgp.pdf",
        "type": "PDF"
    }
],

Notes

• Now, doi can be spelled regardless of any case: doi, DOI, dOi, Doi, etc.
• Did not pull the catalog-data repository when making these changes, but the lack of the repository did not change expected issue or fix