Implement asynchronous support in ODataJsonLightCollectionSerializer

[gathogojr]

Issues

This pull request is a partial fulfilment of issue #2019.

Description

Implement asynchronous support in ODataJsonLightCollectionSerializer

Checklist (Uncheck if it is not completed)

• Test cases added
• Build and test with one-click build and test script passed

Additional work necessary

If documentation update is needed, please add "Docs Needed" label to the issue and provide details about the required document change in the issue.

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[odero]

    internal void WriteCollectionStart(ODataCollectionStart collectionStart, IEdmTypeReference itemTypeReference)

Looking at this method I have to wonder whether there's such a thing as too much async/await. Is this too fine grained to the point it might impact performance? Can/should the write async calls be clustered in a "smart" way instead of doing it almost per character/word write?

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Refers to: src/Microsoft.OData.Core/JsonLight/ODataJsonLightCollectionSerializer.cs:41 in 1546196. [](commit_id = 1546196, deletion_comment = False)

[ElizabethOkerio]

LGTM

[xuzhg]

JsonLightOutputContext.FlushAsync() will flush AsyncchronousJsonWriter?

[gathogojr]

@xuzhg The plan is to change the current implementation of FlushAsync once implementation of asynchronous support is completed across all participating types. When we get there I'll modify it to flush AsynchronousJsonWriter

[KenitoInc]

LGTM

[habbes]

Maybe AsyncJsonWriter :)?

[gathogojr]

Will take this into consideration but it'd have to be a PR by itself since the naming was adopted in an already merged PR and it'd involve changing in quite a few places.