We have the public API `JsonObject.ConvertFromJson` to convert from JSON string in the PowerShell context. It would be good to have a public API for conversion to JSON. This PR refactors the `ConvertTo-Json` cmdlet to move the core implementation to `JsonObject.ConvertToJson`, and make `ConvertTo-Json` call that public method.
This would help the Azure Function PowerShell worker. Currently, we depends on [calling the cmdlet](https://github.com/Azure/azure-functions-powershell-worker/blob/729710d2595b4b96abd4fa5a5547fe880e98bfa6/src/PowerShell/PowerShellManager.cs#L198-L205) to convert object to JSON which is expensive. Once we have the public method `JsonObject.ConvertToJson` exposed, we can call the API directly to avoid a command invocation.
## Motivation
I have a PR where there are many new xUnit tests.
It would also be useful to create new xUnit tests for public APIs.
The number of xUnit tests will increase and their ordering is required.
## PR Summary
- Move C# xUnit tests in new folder. This allows to put new xUnit tests in directory structure in accordance with directory structure where cs files are.
- Use an xUnit TestCaseOrderer attribute to sequentially process tests for `powershell.config.json`.
- Update README.md
- A race condition was fixed which allowed to run all XUnit tests in single batch job.
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