fix(lambda-event-sources): add missing export of ./streams.ts

[RomainMuller]

Fixes #4352

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[mergify]

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[nija-at]

Do we need the experimental tag, now that we're exporting it?

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[aukaurea]

Hello @RomainMuller

How are you?

Can you please help me know an ETA for this branch's release to npm?

Thank you.

[nija-at]

@aukaurea - We're working on releasing this within the next 2 days.

[aukaurea]

Thank yiou @nija-at