Added casefolding for label name comparisons.

[wescran]

Fixes

Fixes #84 by @dhruvkb

Description

This PR is currently a work in progress to solve issue #84
I added the casefold() method to allow for better syncing of the labels.

Technical details

I basically have 2 options for how to solve this. The first involves adding casefolding to the set_labels.py. I am assuming the error was occurring for the conditional on line 48 in set_labels.py:

if final_label_name not in initial_labels:
    logger.log(logging.INFO, "Did not exist, creating...")
    repo.create_label(**final_label.api_arguments)

final_label_name is a string and is checking its value against the key values of initial_labels which in this case are also strings. So if final_label_name have a value of "Bug" and lets say there is a key in initial_labels called "bug", the conditional will succeed causing the label creation error.

So my proposal for the change is to have the keys of both dictionaries housing the labels be normalized with a casefold.

logger.log(logging.INFO, "Fetching initial labels...")
initial_labels = {label.name.casefold(): label for label in repo.get_labels()}
logger.log(log.SUCCESS, f"done. Found {len(initial_labels)} labels.")

logger.log(logging.INFO, "Parsing final labels...")
final_labels = {label.qualified_name.casefold(): label for label in final_labels}
logger.log(log.SUCCESS, f"done. Found {len(final_labels)} labels.")

I had reverted changes I initially made to have casefolidng in the equality operators in models.py. I did this as when comparing labels, we want to make sure that there is differences found when we want to intentionally update the casing of a label.

Tests

I wasn't able to test this with your code as I don't have access to your repository. However, I set up a private repository to test the functions myself. Based on the changes I made, I was able to effectively sync the labels while taking the case insensitivity of GitHub.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable). N/A
• I added or updated documentation (if applicable). N/A
• I tried running the project locally and verified that there are no
  visible errors. N/A

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[dhruvkb]

Verified that it works, assigned to @kgodey to merge.