Toml Stream Writer
A TomlWriter that writes TOML to outputStream.
Note that this writer only wraps the stream, so the following requirements should be met:
Pass in a buffered stream. The writer itself won't buffer in any way.
Call close when finished, or use AutoCloseable.use for short.
Use with Toml.encodeToWriter to encode objects. This is useful for concatenating two TOML streams. However, user should prefer Toml.encodeToStream if only one object is being encoded.