add Picture tag and srcset to Source tag

[ArkahnX]

This adds the Picture element, as well as the srcset attribute to the Source element (used when you have the Source element within a Picture element)

[changeset-bot]

🦋 Changeset detected

Latest commit: 10ec3a1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@kitajs/html	Major
@kitajs/fastify-html-plugin	Major
@kitajs/ts-html-plugin	Major

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[arthurfiorette]

Thanks! Can you add a changesets for it?

[ArkahnX]

Sorry about that, I've included it as a minor changeset, which I believe should be appropriate, but I can downgrade it if needed

[arthurfiorette]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (dc012f0) to head (10ec3a1).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #176   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          465       465           
=========================================
  Hits           465       465           

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