Maint: Normalize line endings and add .gitattributes

[Aditya-myst]

Fixed issue #2802 by adding * text=auto to .gitattributes and renormalizing the repository to ensure consistent LF line endings
As requested, here's the completed PR checklist.

• Closes [Maint] Line ending normalization wrong in some files #2802
• I am familiar with the contributing guidelines.
• I attest that all AI-generated material has been vetted for accuracy and is in compliance with the pvlib license.
• Tests added (Not applicable. This change only adds .gitattributes and renormalizes line endings. The changes were verified locally using Git CLI.)
• Updates entries in docs/sphinx/source/reference for API changes. (Not applicable.)
• Adds description and name entries in the appropriate "what's new" file. (Not applicable; no user-facing or API changes.)
• New code is fully documented. (Not applicable; no new source code.)
• Pull request is nearly complete and ready for detailed review.
• Maintainer: Appropriate GitHub Labels (including remote-data) and Milestone are assigned to the Pull Request and linked Issue.

Summary

This PR fixes #2802 by adding * text=auto to .gitattributes and renormalizing the repository to ensure consistent LF line endings across platforms. I verified the changes locally using Git CLI to confirm that only line-ending normalization was applied and no unintended content changes were introduced.

[github-actions]

Hey @Aditya-myst! 🎉

Thanks for opening your first pull request! We appreciate your
contribution. Please ensure you have reviewed and understood the
contributing guidelines.

If AI is used for any portion of this PR, you must vet the content
for technical accuracy.

[echedey-ls]

Please, add and fill out the PR checklist template to your comment. It's under .github folder.

[Aditya-myst]

As requested, here's the completed PR checklist.

• Closes [Maint] Line ending normalization wrong in some files #2802
• I am familiar with the contributing guidelines.
• I attest that all AI-generated material has been vetted for accuracy and is in compliance with the pvlib license.
• Tests added (Not applicable. This change only adds .gitattributes and renormalizes line endings. The changes were verified locally using Git CLI.)
• Updates entries in docs/sphinx/source/reference for API changes. (Not applicable.)
• Adds description and name entries in the appropriate "what's new" file. (Not applicable; no user-facing or API changes.)
• New code is fully documented. (Not applicable; no new source code.)
• Pull request is nearly complete and ready for detailed review.
• Maintainer: Appropriate GitHub Labels (including remote-data) and Milestone are assigned to the Pull Request and linked Issue.

Summary

This PR fixes #2802 by adding * text=auto to .gitattributes and renormalizing the repository to ensure consistent LF line endings across platforms. I verified the changes locally using Git CLI to confirm that only line-ending normalization was applied and no unintended content changes were introduced.

[echedey-ls]

I meant that you put that checklist on your very first comment, the one at the top of the pull request. It's for traceability and saving time to readers. Thanks.

I have not yet confirmed all the big changes, will do at some point.