Add Mounting Wuerth WP-SMRA 7466300 and 7466303

Made manually (There are only two of them which differ only in the hole size of the 3d model.)

Footprints: kicad-footprints!1615 (merged)

Source: kicad-packages3D-source!227

Datasheets:

• https://www.we-online.com/components/products/datasheet/7466300.pdf
• https://www.we-online.com/components/products/datasheet/7466303.pdf