Use ijson to parse the response to `/send_join`, reducing memory usage. (#9958)

Instead of parsing the full response to `/send_join` into Python objects (which can be huge for large rooms) and *then* parsing that into events, we instead use ijson to stream parse the response directly into `EventBase` objects.

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diff --git a/changelog.d/9958.feature b/changelog.d/9958.feature
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+Reduce memory usage when joining very large rooms over federation.