feat(frontend): support explain with graphviz visualization in dashboard

[lyang24]

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What's changed and what's your intention?

#19542

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Release note

new ui for rendering graphviz output to replace explain distsql.

example usage:

1. run explain (format dot, distsql) xxx and copy the dot output.
2. paste the dot output to dashboard and click parse generate graphviz visualization.

[kwannoel]

We can deprecate all the code related to rendering explain JSON, and remove it from the UI as an option, along with its dependencies. explain (format dot) is the only option we need. It already provides a graph structure, so all we need to do is let a graphviz library render it. It will save us a lot of code.

[kwannoel]

Will try to run it later.

[kwannoel]

LGTM, we can also update the naming of this tab. It can render any graphviz output, so we can rename it as Render Graphviz Dot format.

[kwannoel]

I think the screenshot in the release note also should be updated.

[lyang24]

Render Graphviz Dot format

updated the release note and updated title to Render Graphviz Dot format