sonic_rs::to_{writer, writer_pretty} over arbitrary I/O writers

[aumetra]

Is your feature request related to a problem? Please describe.

It would be great if the sonic_rs::to_{writer, writer_pretty} could be used with arbitrary I/O writers.
In particular, I'm attempting to implement a trait which only receives an io::Write type and I would like to serialize the JSON directly into the writer without any intermediate buffering.

Describe the solution you'd like

Any type that implements std::io::Writer can be used with sonic_rs::to_{writer, writer_pretty}

Describe alternatives you've considered

Write a wrapper struct that implements WriteExt but I'm not sure how to implement the trait for arbitrary writers

[liuq19]

Thanks, maybe we need GrowedBufWriter<W: Write> as a wrapper with WriteExt trait to fix the problem?

We will investigate it