Implement asynchronous support in ODataJsonLightSerializer

[gathogojr]

Issues

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

Description

Implement asynchronous support in ODataJsonLightSerializer, ODataJsonLightValueSerializer, ODataJsonLightPropertySerializer and JsonLightInstanceAnnotationWriter

Disclaimer:
This PR ended up affecting 5 classes due to dependencies that were not easy to go around without ending up with an incomplete/non-functional API. For the following reasons:

• ODataJsonLightSerializer class has a hard-coded dependency on JsonLightInstanceAnnotationWriter and invokes particular methods to write instance annotations.
• JsonLightInstanceAnnotationWriter class has a hard-coded dependency on ODataJsonLightSerializer and ODataJsonLightValueSerializer classes and invokes methods from both classes in the course of writing instance annotations.
• ODataJsonLightValueSerializer class has a hard-coded dependency on ODataJsonLightPropertySerializer class
• Both ODataJsonLightValueSerializer and ODataJsonLightPropertySerializer subclass ODataJsonLightSerializer

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.

[marabooy]

LGTM

[xuzhg]

Task [](start = 17, length = 4)

why no async key word?

[gathogojr]

@xuzhg Eliding is recommended when a method is a pass-through. See this article on the subject
https://blog.stephencleary.com/2016/12/eliding-async-await.html#recommended-guidelines:~:text=Recommended%20Guidelines
This method qualifies as a pass-through since it merely calls another method to do the job.
Eliding will save us the overhead of creating and later garbage-collecting the state machine.
For that reason, I'm eliding the async and await whenever the method is just a pass-through

[xuzhg]

System.Threading.Tasks; [](start = 6, length = 23)

sort #Resolved

[xuzhg]

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Total files changed: 10

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.cs : +1347 -41

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