feat: support for GIFs in splash screen for web

[OutdatedGuy]

Added animated GIF support for branding, splash and background images on web.

Test Configuration Details

Images

Main	Background	Branding

Config Code

flutter_native_splash:
  # color: "#e1f5fe"
  background_image: "assets/splash-images/splash-bg.png"
  image: assets/splash-images/loading-hand.gif
  branding: assets/splash-images/branding.png

  # color_dark: "#042a49"
  background_image_dark: "assets/splash-images/splash-bg.png"
  image_dark: assets/splash-images/loading-hand.gif
  branding_dark: assets/splash-images/branding.png

  # The android, ios and web parameters can be used to disable generating a splash screen on a given
  # platform.
  android: false
  ios: false
  #web: false

  fullscreen: true

Working

After running flutter pub run flutter_native_splash:create

Before

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pixelDensity	Resultant Image
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Final Result

After

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pixelDensity	Resultant Image
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Final Result

related #245

[jonbhanson]

Thanks @OutdatedGuy!