V3 checklist

[bartelink]

• Cosmos: continues to target Equinox.Cosmos >= 2.6.0, so can not be used side by side with Propulsion.* >=3.0.0. Probably remove in 3.x
• CosmosStore: target non-preview CFP logic (I believe that will be in Microsoft.Azure.Cosmos 3.21.0 see PR)
• rename maxDocuments to maxItems for CosmosStore
• Add AwaitWithStopOnCancellation
• Kafka: target FsKafka/CK ~1.7 V1.7.0 checklist FsKafka#48
• Kafka0: remove see V1.7.0 checklist FsKafka#48
• remove net461 multitargeting
• EventStore: update to target Equinox.* 3.0.0. Probably remove in 3.x
• SqlStreamStore: update to target Equinox.* 3.0.0 (currently does not bind to Equinox)
• CosmosStore3: target Equinox.CosmosStore 3.x
• CosmosStore: target Equinox.CosmosStore >= 4
• EventStoreDb: target Equinox.EventStoreDb >= 4
• remove dependency on .Destructure.FSharpTypes by replacing Option with Nullable and list with Array
• Replace all tuples with ValueTuple and other cleanup (see V3 cleanup and signature changes #169)
• Propulsion: push StreamSpan and/or an equivalent down into FsCodec (or perhaps use tuples for signatures)
• Propulsion, CosmosStore, Cosmos: separate out .Prometheus packages
• Propulsion: Consider removing Parallel stuff and/or shifting it out to a specific package as
  a) it has no metrics
  b) it has low usage
  c) while its arguably an on-ramp to understanding the streams impl, it also increases the concept count
• Improve serverless support and resource consumption by:
  • replacing combinations of SemaphoreSlim + ConcurrentQueue + Async Write APIs with usage of System.Threading.Channels
  • provide a Lambda-hosted DynamoStore projection loop mode which (subject to a timeout and linger period), reads from the index, runs the projections (and/or cancels them if if the timeout has been reached), checkpoints until one of:
    • timed out
    • index tail reached and linger period expired
  • provide an Azure Functions mode where
    • the trigger feeds in a batch, which is fed into the Sink
    • chain completes when the batch has completed, roughly like how MemoryStoreProjector provides an AwaitWithStopOnCancellation
• Kafka: Separate Sink from Consumer/Source in the StreamsProjector in manner equivalent to how it works for other sources in order that Kafka does not need to be special-cased wrt SourceArgs in the dotnet-templates proReactor template
• EventStore: Merge the striped reader support into EventStoreDb and remove