Add PlantUML support

[johnfawzy84]

Is your feature request related to a problem? Please describe.
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My feature request is not related to a problem. It is a complete new feature

Describe the solution you'd like
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I would like to add a support for PlantUML diagrams.

Describe alternatives you've considered
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Mermaid is a good option as alternative, but PlantUML provide a big variaty of drawings and elements.

Additional context
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https://plantuml.com/de/

[joshwand-aws]

There's an existing PlantUML plugin that could be integrated with:

https://github.com/joethei/obsidian-plantuml

[rootandy]

The PlantUML Plugin is already there, but while the plantuml gets rendered in reading Mode they are not rendered in the (advanced) slides. Only in the "standard" slides plugin of obsidian.