Add generated ST_WLCSP-208_5.8x5.6mm_P0.35_Stagger

Adding a generated ST_WLCSP-208_5.8x5.6mm_P0.35_Stagger

fp mr: kicad-footprints!3433 (merged)

ST_WLCSP-208_5.8x5.6mm_P0.35_Stagger:
  description: "ST WLCSP-208, ST die ID 476"
  size_source: "https://www.st.com/resource/en/datasheet/stm32u5f9bj.pdf"
  body_size_x: 5.8
  body_size_y: 5.6
  pitch: 0.35
  staggered: x
  first_ball: A2
  pad_diameter: 0.200
  mask_margin: 0.0375
  paste_margin: 0.015
  layout_x: 26
  layout_y: 16

Datasheet https://www.st.com/resource/en/datasheet/stm32u5f9bj.pdf