feat(eslint-plugin): deprecate no-type-alias

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes Deprecate no-type-alias #6036
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Adds deprecated: true to the rule's metadata and adds a couple of admonitions explaining it. Although the rule is indeed closer to no-restricted-syntax per #6036 (comment), I think it's easier for users to be explained that we recommend using consistent-type-definitions instead, + no-restricted-syntax if they really need.

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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