feat: Enhanced sender avatars with gravatar and favicons integration (#685)

* feat: Enhanced sender avatars with gravatar and favicons integration

* chore: Remove unused known companies thumbnails

* feat(thumbnail): add IThumbnailService and refactor usage

- Introduced a new interface `IThumbnailService` for handling thumbnail-related functionalities.
- Registered `IThumbnailService` with its implementation `ThumbnailService` in the service container.
- Updated `NotificationBuilder` to use an instance of `IThumbnailService` instead of static methods.
- Refactored `ThumbnailService` from a static class to a regular class with instance methods and variables.
- Modified `ImagePreviewControl` to utilize the new `IThumbnailService` instance.
- Completed integration of `IThumbnailService` in the application by registering it in `App.xaml.cs`.

* style: Show favicons as squares

- Changed `hintCrop` in `NotificationBuilder` to `None` for app logo display.
- Added `FaviconSquircle`, `FaviconImage`, and `isFavicon` to `ImagePreviewControl` for favicon handling.
- Updated `UpdateInformation` method to manage favicon visibility.
- Introduced `GetBitmapImageAsync` for converting Base64 to Bitmap images.
- Enhanced XAML to include `FaviconSquircle` for improved UI appearance.

* refactor thumbnail service

* Removed old code and added clear method

* added prefetch function

* Change key from host to email

* Remove redundant code

* Test event

* Fixed an issue with the thumbnail updated event.

* Fix cutted favicons

* exclude some domain from favicons

* add yandex.ru

* fix buttons in settings

* remove prefetch method

* Added thumbnails propagation to mailRenderingPage

* Revert MailItemViewModel to object

* Remove redundant code

* spaces

* await load parameter added

* fix spaces

* fix case sensativity for mail list thumbnails

* change duckdns to google

* Some cleanup.

---------

Co-authored-by: Aleh Khantsevich <aleh.khantsevich@gmail.com>
Co-authored-by: Burak Kaan Köse <bkaankose@outlook.com>

Wino.Mail/Styles/ImagePreviewControl.xaml

@@ -28,13 +28,27 @@
                                     Foreground="White" />
                             </Grid>
 
+                            <!--  Squircle for favicon  -->
+                            <Border
+                                x:Name="FaviconSquircle"
+                                Width="{TemplateBinding Width}"
+                                Height="{TemplateBinding Height}"
+                                HorizontalAlignment="Center"
+                                VerticalAlignment="Center"
+                                Background="Transparent"
+                                CornerRadius="6"
+                                Visibility="Collapsed">
+                                <Image x:Name="FaviconImage" Stretch="Fill" />
+                            </Border>
+
                             <Image
                                 x:Name="KnownHostImage"
                                 Width="{TemplateBinding Width}"
                                 Height="{TemplateBinding Height}"
                                 HorizontalAlignment="Center"
                                 VerticalAlignment="Center"
-                                Stretch="UniformToFill" />
+                                Stretch="UniformToFill"
+                                Visibility="Collapsed" />
                         </Grid>
                     </ControlTemplate>
                 </Setter.Value>