Add pre-commit hook for gofmt

[axif0]

Contributor checklist

• This pull request is on a separate branch and not the main branch

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Description

• Adds pre-commit hook to auto-check Go formatting
• Shows clear messages when files need formatting
• Prevents commits until code is properly formatted

Related issue

• Implement GitHub Action for Go Code Formatting #25

[github-actions]

Thank you for the pull request! ❤️

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[axif0]

As the license_header_check error occurred, If the PR approved, we might marge this PR before #23.

[andrewtavis]

@axif0, don't we also want a GitHub Action in the .github/workflows directory to check the formatting on all files for pull requests? Would we be able to get that included in this PR as well? :)

[andrewtavis]

Or I guess ultimately the beauty of the Makefile is that people have to install these, so it's not the case like pre-commit that we need to check on PRs as well if they didn't install :)

[andrewtavis]

Thanks for the changes here, @axif0! I removed the echo for trimming whitespace as it didn't make sense to me, but if it's needed then feel free to add it in to the other PR 😊

[andrewtavis]

Merging this in and we can get the license headers from #23 as suggested :)