Add SOP-16_7.5x10.3mm_P1.27mm

Fix for #2545 (closed)

Make sure your submission follows the KiCad Library Convention.

Check the output of the automated check scripts - fix any errors as required.

Checking footprint 'SOP-16_7.5x10.3mm_P1.27mm' - No errors

Provide a URL to a datasheet for the footprint(s) you are contributing.

https://www.ti.com/lit/ds/symlink/pcf8574a.pdf

See page 34:

If there are matching symbol, 3D model or script pull requests, provide link(s) as appropriate.

Technically, PCF8574A is matching. However, this footprint comes in multiple packages, so I would have the user link their correct footprint