feat: remove unused imports and update prettier

[aditya-mitra]

Summary

• updated "prettier" to version 3
• added "@ianvs/prettier-plugin-sort-imports" version 4.1.0
• added "prettier-plugin-organize-imports" to remove unused imports
• had first thought of using vscode's sortImports to remove unused imports when saving a file. But this might cause some problems with every save like import being lost when saved and before used OR bringing unwanted changes to a file when saving it.

References

Checklist

• If this PR is still a WIP, convert to a draft
• When this PR is ready, mark it as "Ready for review"
• ensure all checks pass
• Changes have been manually QA'd
• Changes reviewed by at least 2 approved reviewer

QA Steps

List any additional steps required to QA the changes of this PR, as well as any supplemental images or videos.

[aditya-mitra]

some options removed by v4.0.0 's breaking changes here