Description:

Could the IBsonWriter interface support adding the following methods to enable better memory allocation avoidance at the upper layer?
 

void WriteBytes(byte[] bytes, int offset, int length)
void WriteBytes(ReadOnlySpan<byte> bytes) 

Motivation:Currently, when writing byte data through IBsonWriter, upper-layer code often needs to perform additional memory allocations or array copying operations. Adding these overloads would allow: # Slice-based writing: WriteBytes(bytes, offset, length) enables writing a portion of an existing byte array without creating a new array

1. Span-based writing: WriteBytes(ReadOnlySpan<byte>) provides modern, allocation-free API for writing memory segments