Migrate webpack scripts to TypeScript

[joeykilpatrick]

Changes
Migrate webpack build scripts to TypeScript (webpack.*.js --> webpack.*.ts)
Adds ts-node as loader for webpack CLI

[github-actions]

ESLint doesn't pass. Please fix all ESLint issues.

[jellyfin-bot]

Cloudflare Pages deployment

Latest commit	b6fff3b
Status	✅ Deployed!
Preview URL	https://14e4ea4c.jellyfin-web.pages.dev
Type	🔀 Preview

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[jellyfin-bot]

This pull request has merge conflicts. Please resolve the conflicts so the PR can be successfully reviewed and merged.

[sonarcloud]

Quality Gate failed

Failed conditions
1 Security Hotspot

See analysis details on SonarCloud

[joeykilpatrick]

1. I'm not sure how to get Github Actions to re-review now that eslint issue is fixed.
2. The Sonarcloud failure is not related to this change, but I would be happy to add webpack.*.ts to the list of excluded files for that scan. Just looking for some feedback before I do that. I don't see a platform-independent way to address the issue.

[thornbill]

No worries. I'll take care of both of those. The review just has to be dismissed since the action doesn't update the status once issues are fixed and I can accept the issue in sonarcloud to clear that.