Plan potential switch to Rust

[ChurchOfTheSubgenius]

This POC codebase is very simple and straightforward. It isn't doing anything beyond reading events from the Synapse DB and associated views , aggregating and sending them back to the client.

It may be worth thinking about switching over to Rust at this early stage. Something like Axum should work nicely.

[erlend-sh]

When this is underway, that might be a good time to revisit Conduit as well. With support for threads, spaces and sliding sync, it’s now much closer to essential feature parity with Synapse.