- By using [package:image](https://pub.dev/packages/image), the
`MatrixImageFile` was given automatically generated width and heigth.
- Moreover, `MatrixImageFile` was given a factory to create the image
file from a given maximal dimension.
- When sending images without explicitly providing a thumbnail, the
thumbnail is automatically generated based on the provided image.
- The blur hash in generated automatically based on the provided image.
Fixes:
https://gitlab.com/famedly/company/frontend/famedly-web/-/issues/162, https://gitlab.com/famedly/fluffychat/-/issues/756
Signed-off-by: Lanna Michalke <l.michalke@famedly.com>
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