added Plotly materializer

[zilto]

--- PR TEMPLATE INSTRUCTIONS (2) ---
Added Plotly materializer supports both static formats (JPG, PNG, SVG, etc.) and interactive format (HTML + JS)

Changes

Added PlotlyInteractiveSaver and PlotlyStaticSaver along with tests.

How I tested this

Added a test to check files were properly written for each DataSaver. I manually checked that the written files could be properly opened

Notes

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[skrawcz]

@zilto seems like 3.7/3.8 python syntax to fix up. Otherwise looks good.