react-command-convert-to-pdf - Updated

[NicolasKheirallah]

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Q	A
Bug fix?	no
New feature?	yes
New sample?	no
Related issues?	Updated to latest SPFX, Rewrote and cleaned up alot and moved from using third party to using Graph to both get request the file but also converting it!

What's in this Pull Request?

Please describe the changes in this PR. Sample description or details around bugs which are being fixed.
Upgrade SPFx to version 1.20.1, rewrite it from scratch using Graph API and using the built in converter in Graph, moved to Fluent UI and alot more