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## Description ✍️
This PR adds the architecture deep dive of streaming subscriptions and benchmarks for up to 1M active subscriptions.
### Kodiak commit message
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#### Commit title
architecture: add streaming subscriptions
#### Commit body
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PR-URL: https://github.com/hasura/graphql-engine-mono/pull/5576
Co-authored-by: Tanmai Gopal <131160+coco98@users.noreply.github.com>
GitOrigin-RevId: 72c37f3e33a4483dcd12a6c1d7830a8c62d6185f
