Add SSO-8-7 (6.4x9.7mm) package

Push of BC2213A Thrysistor Solid state relay. Very similar to the Panasonic AQH0213A.

Datasheet https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2312161855_BC-BC2213A_C596512.pdf

Result of script Package_SO.pretty/SSO-8-7_6.4x9.7mm_P2.54mm.kicad_mod

Merge Request of footprint repro kicad-footprints!3662 (merged)