Support StackBlitz embed

[tsuzuki-takaaki]

Support StackBlitz embed.
You can embed StackBlitz with iframe like this:

<iframe src="https://stackblitz.com/edit/angular?embed=1"></iframe>

Refs

• StackBlitz Embedding projects
  • https://developer.stackblitz.com/guides/integration/embedding

[gemini-code-assist]

Summary of Changes

Hello @tsuzuki-takaaki, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the capability to embed StackBlitz projects directly into markdown content processed by this library. It involves adding a new module for StackBlitz configuration, updating the iframe filtering logic to permit StackBlitz URLs, and including corresponding tests to ensure the functionality works as expected.

Highlights

• New Embed Support: Added support for embedding StackBlitz projects within markdown content by allowing iframes from stackblitz.com.
• Module Structure: Introduced a new StackBlitz module under Qiita::Markdown::Embed to encapsulate configuration related to StackBlitz embeds, specifically its script host.
• Iframe Filtering: Updated the FilterIframe transformer to include stackblitz.com in the list of allowed iframe sources, ensuring StackBlitz embeds are not stripped or modified by the filter.
• Test Coverage: Added new test cases in processor_spec.rb to verify that iframes pointing to stackblitz.com/embed/... are correctly processed and allowed by the markdown processor, covering URLs with and without a scheme.

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[gemini-code-assist]

Code Review

The pull request introduces support for StackBlitz embeds. I've suggested enhancing the test coverage by including initial attributes in the test case, which would provide a more comprehensive validation of attribute handling.