UnsafeBufferSequence
This class is a helper to write to a IBufferWriter<T> in a thread safe manner.
It uses the shared pool to allocate buffers and returns them to the pool when disposed.
Since there is no way to ensure someone didn't keep a reference to one of the buffers
it must be disposed of in the same context it was created and its referenced should not be stored or shared.
Initializes a new instance of UnsafeBufferSequence.
Notifies the UnsafeBufferSequence that bytes bytes were written to the output Span<T> or Memory<T>.
You must request a new buffer after calling Advance to continue writing more data; you cannot write to a previously acquired buffer.
Disposes the SequenceWriter and returns the underlying buffers to the pool.
Returns a Memory<T> to write to that is at least the requested size, as specified by the sizeHint parameter.
Returns a Span<T> to write to that is at least the requested size, as specified by the sizeHint parameter.