* refactor: add electron::Buffer namespace; move the Buffer as_byte_span() into it
* feat: add electron::Buffer::Copy()
a span-friendly version of node::Buffer::Copy()
* refactor: use electron::Buffer::Copy() in electron_api_base_window.cc
* refactor: use electron::Buffer::Copy() in electron_api_data_pipe_holder.cc
* refactor: use electron::Buffer::Copy() in electron_api_safe_storage.cc
* refactor: use electron::Buffer::Copy() in electron_api_clipboard.cc
* refactor: use electron::Buffer::Copy() in osr_converter.cc
* refactor: use electron::Buffer::Copy() in electron_api_native_image.cc
* refactor: use electron::Buffer::Copy() in net_converter.cc
* refactor: use electron::Buffer::Copy() in electron_api_web_contents.cc
* refactor: make NewEmptyBuffer() return a Local<Value>
06a99d6770