Schema update for umm-c (1.18.2 to 1.18.4)

[lavanya3k]

Description of the PR: This is PR request to update the schema for umm-c. The code changes will automatically read the schema format from the NASA cdn website. By directly referencing the .json schema file from the NASA schema collection, we eliminate the need to manual update the .json files in PyQuARC. The code fix also includes capabilities to quickly update the schema to the recent version, depending on the PyQuARC or ESDS needs during the release.

Code changes: The code changes are made in the schema_Validator.py, checker.py, and utils.py. Further, we updated the outdated files in the test_downloader.py and schema_validator.py. There was an outdated imports DraftValidator, and this has to be updated before every commit. The final code is test by running pytest, and the run was successful before committing the code changes.

To reproduce:
C1000000010-CDDIS (umm-c 1.18.4)
C1905434780-CDDIS (umm-c 1.18.3)
C2792603656-CDDIS (umm-c 1.18.3)

Expected output: You should not see a flag for MetadataSpecification/Version when you run PyQuARC.

[lavanya3k]

We are not including code changes for dif10 due to the file conversion from *.xsd. Further, the schema version inside the PyQuARC folder refers to the latest version of dif10.