Changes reflecting ClinVar API updates and improvements

[2.0]

Added

• A new tsv_2_json endpoint to convert TSV files in json submission objects
• Keep a Changelog GitHub action
• Black GitHub action
• Flake8 Lint GitHub action
• Vulture GitHub action
• Woke GitHub action
• Badges showing the status of GitHub actions on README page
• File conversion endpoints accept optional parameters to set the following key/values: submissionName, clinvarSubmissionReleaseStatus, assertionCriteria

Changed

• New API schema introduced on 2022-11-21
• Modified file parsing code to create submission jsons compliant with the new API
• Renamed the old demo CSV files to FILENAME_before_221121.csv
• Demo json submission file to include submissionName and clinvarSubmissionReleaseStatus key/values

Fixed

• Do not crash when parsing Variant CSV files with no assertion criteria
• Simplify and fix CSV and TSV files parsing