feat: gumlet image provider

[pi0]

(#467 rebased with main)

[codecov-commenter]

Codecov Report

Merging #489 (8b6950c) into main (77bbfdb) will increase coverage by 58.95%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            main     #489       +/-   ##
==========================================
+ Coverage   0.00%   58.95%   +58.95%     
==========================================
  Files         28       31        +3     
  Lines        587      670       +83     
  Branches     188      213       +25     
==========================================
+ Hits           0      395      +395     
+ Misses       585      269      -316     
- Partials       2        6        +4     

Impacted Files	Coverage Δ
src/provider.ts	74.28% <ø> (+74.28%)	⬆️
src/runtime/providers/gumlet.ts	100.00% <100.00%> (ø)
src/runtime/components/nuxt-img.vue	70.00% <0.00%> (ø)
src/runtime/components/nuxt-picture.vue	65.95% <0.00%> (ø)
src/generate.ts	3.44% <0.00%> (+3.44%)	⬆️
src/runtime/utils/static-map.ts	6.66% <0.00%> (+6.66%)	⬆️
src/runtime/utils/index.ts	56.86% <0.00%> (+56.86%)	⬆️
src/ipx.ts	64.28% <0.00%> (+64.28%)	⬆️
src/utils.ts	64.28% <0.00%> (+64.28%)	⬆️
src/runtime/providers/sanity.ts	64.86% <0.00%> (+64.86%)	⬆️
... and 17 more

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