feat: add *.svelte.{js,ts} config to base config

[ota-meshi]

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eslint-plugin-svelte	Major

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[baseballyama]

I think this PR is helpful, but I don’t this it can close #1030.
To put it simply, #1030 is asking for a rule to report cases where runes like $state are used in .js files (not .svelte.js files).

[ota-meshi]

Thanks for letting me know! I guess I misunderstood 😅
I removed the close comment.