Implement asynchronous support in JsonReader

[gathogojr]

Issues

This pull request is a partial fulfilment of #2019 .

Description

Implement asynchronous support in JsonReader

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.

[KenitoInc]

Why are we using this attribute?

[gathogojr]

@KenitoInc I'd like to apply these attribute to methods that one almost never wants to step into when debugging, CheckArgumentNotNull for example. It improves the debugging experience

[xuzhg]

It seems we can put "non-null" and "null" test in to one [Theory] test?

[gathogojr]

In the [Theory] test, it's \"null\" (as a string) so we're just verify that it's read as a string. In this test, its just null and we're verifying that's its read as null. I hope I understood your question correctly

[xuzhg]

[corranrogue9]

I almost feel like this switch would be easier to understand if there was one for commaFound == true and one for commaFound == false. Probably not worth changing now, but maybe something to consider.

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This PR has 952 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Extra Large
Size       : +917 -35
Percentile : 98.4%

Total files changed: 3

Change summary by file extension:
.cs : +917 -35

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