Implement silkscreen reference designators for every component

[seveibar]

(feel free to edit this issue with a checklist)

Below shows a reference designator from kicad. All of our footprints should have reference designators (silkscreen_text) with the text "{REF}"

[homie-gg[bot]]

Here are some pull requests that might be helpful reference for this task:

• fix: update layout engine to fix silkscreen footprints not moving when translated via manual edits
• diode and led fix
• Fixed silkscreen issue of some components

[homie-gg[bot]]

This might have already been done via: feat: pcb silkscreen text added.

[homie-gg[bot]]

This might have already been done via: Ref and value text added.