enable init.meta.json in init.client.luau folders to support changing className while having emitLegacyScripts diabled

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when having emitLegacyScripts disabled in the root .project.json, the only way to add a LocalScript is by having an folder with an init.meta.json and writting the source property in there, which is very bad cause you basically write a string without any intellisense, etc.

[ghost]

in the ross rojo channel all other ways were tried https://discord.com/channels/385151591524597761/596685628792373264/1396413387814076486