feat: add loading image from fetching URL

[EscapedGibbon]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (595ca54) to head (8e8e99a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #482   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files         244      245    +1     
  Lines       10027    10035    +8     
  Branches     2145     2146    +1     
=======================================
+ Hits         9875     9883    +8     
  Misses        152      152           

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[stropitek]

The new method is not exported.

Don't mention "dataurl" in the commit message (just URL).

Otherwise LGTM.