[TypeScript] Missing event "limit" on BusboyFileStream

[hornta]

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Issue

I think the typings could be improved on BusboyFileStream. For example the "limit" event is missing from the possible events to listen to. In this image, I expect "limit" to be a possible event. Possible other events are missing as well.

[gurgunday]

Thanks for reporting. Would you like to send a PR?