Direct pixel access to D2DBitmap

Hi, is there a way to directly change byte array of D2DBitmap as it's possible in C++ D2D? Something like this in C++:

```cpp
// Assuming you have a valid ID2D1Bitmap* named bitmap
D2D1_BITMAP_PROPERTIES bitmapProperties;
bitmap->GetDpi(nullptr, nullptr);
bitmap->GetPixelFormat(&bitmapProperties.pixelFormat);

UINT32 width, height;
bitmap->GetSize(&width, &height);

UINT32 pixelSize = bitmapProperties.pixelFormat.GetPixelSize();
UINT32 stride = width * pixelSize;

D2D1_MAPPED_RECT mappedRect;
HRESULT hr = bitmap->Map(D2D1_MAP_OPTIONS_READ | D2D1_MAP_OPTIONS_WRITE, &mappedRect);
if (SUCCEEDED(hr))
{
BYTE* pixelData = mappedRect.bits;
// Now you can access and modify the pixel data here

// Make sure to unmap the bitmap when you're done editing
bitmap->Unmap();
}
```
It could help us improve the performance, since every time we call CreateBitmapFromMemory, a new bitmap is created in memory.

Start by locating the D2DBitmap API and the CreateBitmapFromMemory path, then compare the library's exposed operations with the Direct2D Map and Unmap behavior shown in the issue. Determine the required API and ownership or synchronization rules for mutable pixel data. Done means the supported access path and its performance implications are implemented or clearly documented.

Written by the indexing model from the issue text.