[Repo Assist] Add AsyncSeq.mapAsyncUnorderedParallelThrottled

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Closes #31

Summary

Adds AsyncSeq.mapAsyncUnorderedParallelThrottled, a new function that maps an async function over an AsyncSeq in parallel with:

• Unordered emission: results are emitted as soon as they complete, not in source order
• Throttled concurrency: at most parallelism operations run concurrently (via SemaphoreSlim)

This directly addresses issue #31 (requested in 2015) and fills the gap between:

• mapAsyncUnorderedParallel (unordered but unbounded parallelism)
• iterAsyncParallelThrottled (throttled but no results returned)

Implementation

The implementation directly combines the established patterns from mapAsyncUnorderedParallel and iterAsyncParallelThrottled. No new dependencies or abstractions were introduced.

// Signature (in .fsi)
val mapAsyncUnorderedParallelThrottled : parallelism:int -> mapping:('T -> Async<'U>) -> s:AsyncSeq<'T> -> AsyncSeq<'U>

Example use case (from #31):

let downloadAll parallelCount =
    jobs
    |> AsyncSeq.mapAsyncUnorderedParallelThrottled parallelCount download

Test Status

• Build: could not be verified locally — NuGet package restore is blocked by the environment firewall (same infrastructure limitation as previous Repo Assist PRs). The CI pipeline has full NuGet access and will verify build correctness.
• Tests: could not run locally for the same reason. Previous pattern-equivalent functions (mapAsyncUnorderedParallel, iterAsyncParallelThrottled) are tested; this function follows identical logic.

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Warning

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The following domains were blocked by the firewall during workflow execution:

• api.nuget.org
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[dsyme]

Updated network access for Repo Assist, should be able to restore and test now

[dsyme]

Needs tests and testing