Remove unused variable and update URLs

[ZeroCool940711]

This pull request includes the following changes:

• Remove the unused local variable "end".

• Used https in some URLs instead of http for security.

• Added Codiumai.toml file to configure the VS Code extension. This can be used for generating a large number of tests covering different scenarios as well as general code improvements.

• Removed old xrange/range import from whoosh.compact that was there to fix issues on old Python versions (2.7-3.6). We have removed this since we are trying to focus on support for Python 3.8+ and this code would just be duplicated code that is hard to maintain.

• Added a few more tests to increase coverage.

• Added .codiumai.local.toml to the gitignore since this file is meant to be ignored and not on the repo.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (b85d900) 80.92% compared to head (53db475) 80.97%.

Files	Patch %	Lines
tests/test_columns.py	92.38%	0 Missing and 8 partials :warning:
src/whoosh/automata/fsa.py	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #61 +/- ## ========================================== + Coverage 80.92% 80.97% +0.05% ========================================== Files 133 133 Lines 29410 29496 +86 Branches 5053 5066 +13 ========================================== + Hits 23799 23884 +85 + Misses 4742 4737 -5 - Partials 869 875 +6 ```

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