Added Traco TEA1 symbol

Hello everyone 😄

This is the symbol for the TEA 1 series (which only has 1 model).

Datasheet: https://www.tracopower.com/products/tea1.pdf (see last page for the symbol)

MR Footprint: kicad-footprints!3259 (merged)

MR Footprint Generator Script: kicad-footprint-generator!917 (merged)

The KLC-Checker did not throw any errors.

Hope everything looks good. -Jens