feat: add imgAttrs property to nuxt-picture

[codeflorist]

Currently there is no way to add any additional attributes (e.g. id, class, style, etc.) to the img element inside the nuxt-picture component.

This PR adds a imgAttrs property to nuxt-picture which takes an object, which can include any attributes one might like to add to the img element.

Fixes #317, Fixes #288, Fixes #449 and possibly #320

[pi0]

Thanks!

[codecov-commenter]

Codecov Report

Merging #445 (25bbbba) into main (512a54a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #445   +/-   ##
=======================================
  Coverage   59.62%   59.62%           
=======================================
  Files          28       28           
  Lines         634      634           
  Branches      198      198           
=======================================
  Hits          378      378           
  Misses        256      256           

Impacted Files	Coverage Δ
src/runtime/components/nuxt-picture.vue	77.50% <100.00%> (ø)

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