Async IStreamable support

[ganeshnj]

Describe the feature

IStreamable protocol currently seeks and writes synchronously which works for pure request/response but same model can't be applied to event streaming where events come asynchronously.

Use Case

Event Streams.

Proposed Solution

Adapt IStreamble to async conventions

public protocol IStreamable {
    func length() throws -> UInt64
    func seek(offset: Int64, streamSeekType: StreamSeekType) throws
    func read(buffer: UnsafeMutableBufferPointer<UInt8>) async throws -> Int?
}

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

[ganeshnj]

We don't need this at this point as we have H2 async API.

We need to have a doc with more concrete use cases.

[waahm7]

Closing for now. We can revisit this when we have a more concrete use case.

[github-actions]

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