Summary of the new feature / enhancement

Currently, the ConvertTo-Json cmdlet assembles all input objects into an in-memory List, then converts that to one Json string for output. This can be inefficient if there are many input objects.

Enhancing ConvertTo-Json to (optionally) convert each input object to a complete Json string and output
as it is processed offers these benefits:

• reduced memory usage
• substantially improved throughput when the output stream is being processed by a separate thread
  or process.

Proposed technical implementation details (optional)

Add an AsStream parameter to the cmdlet and modify the code to convert and output each object individually.