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Description of Changes
There is only one place where we use Channels, and it's to create and await a channel with one element - which is functionally the same as a more precise and low-weight TaskCompletionSource.
Switching also makes the SDK compatible with the widely supported .NET Standard 2.1 subset, which is supported natively in Unity and allows to remove a custom System.Threading.Channels package from Unity SDK dependencies.
API
If the API is breaking, please state below what will break
Requires SpacetimeDB PRs
List any PRs here that are required for this SDK change to work