Add pwa attribute `pwa_name` and `pwa_description`

What does this MR do and why?

Related to #375708 (closed)

Adds pwa_name and pwa_description to appearances (model)

Adds api endpoints for the new attributes

Adds attributes to appearance controller (for GUI !107466 (merged))

Loads value of new attributes to manifest.json

For context: !104582 (comment 1220205708)

MR acceptance checklist

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