Add Sod-70 (Thinner but longer TO-92) for temp sensor
NXP seems to use a special package for KTY81. They call it SOD70. It has a slightly smaller diameter but is also a bit longer than TO-92.
This adds a footprint generated via kicad stepup. (source file is again part of the pull request.)
Edit: datasheet: https://www.nxp.com/docs/en/data-sheet/KTY81_SER.pdf
and of course this is for https://github.com/KiCad/kicad-symbols/issues/520