feat: add new diag "namespace alias" in javascript code

[UnfairBots]

Summary: Add new diag E0719, using Typescript namespace alias in javascript code to separate E0274, rename some test functions from import_alias to namespace_alias

This closes #1138

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recheck

[UnfairBots]

Hello @strager, I updated new patch and resolved your comments, please review and let me know if any change is required. Thanks

[strager]

Landed as Git commit 24040d4e3a5e3c7da8ca08f719d32491fe768d25. Thanks again!