Add support for implicit figures for images

I'm using builder.UseFigures() in my pipeline builder code, but I don't see figure output rendered.

Example here:
https://babelmark.github.io/?text=!%5BSave+Image+to+Azure+Blob+Storage+Addin%5D(https%3A%2F%2Fgithub.com%2FRickStrahl%2FSaveToAzureBlob-MarkdownMonster-Addin%2Fraw%2Fmaster%2FSaveToAzureMarkdownMonsterAddin.gif)%0A

Markdig renders the image only which seems like Figures is not doing anything. Pandoc renders with figure classes, multi-markdown uses figure proper figure/figcaption elements.

Looks like MarkDig should render figure/figurecaption, but I don't see it rendered. Double checked to make sure FigureExtension is loaded in the final PipelineBuilder used to render with:

Markdown.Convert(markdown, renderer, Pipeline);

BTW, how does the Markdig Parser run in BabelMark? With all options enabled?

Start by tracing builder.UseFigures(), FigureExtension, and the Markdown.Convert(markdown, renderer, Pipeline) entry point. Compare Markdig's current image output with the figure and figcaption behavior described for Pandoc and multimarkdown, including the BabelMark example. Done means enabled figures produce the expected figure markup for images.