* Added webp package into app/emoji.go , also added a test
* fixed import order inside emoji.go
* Ran go mod tidy
* Conversion to png for Webp emojis that must be resized is implemented
* Deleted unused import
* Added reading mechanism for webp instead of creating
* fileutils and filepath are used while reading a webp file during test
* Deleted readtestwebp function and put it in emoji_test as requested
* Added webp image upload test inside api4/file_test.go
* Expect image is changed from false to true
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
