Battery_Management: Add DW03 (Lithium battery protection IC)

This is a battery protection IC, similar to the DW01 ( !4570 (merged)) but with integrated MOSFETs. I have played around with the pin layout and I feel following the datasheet is the most simple way (layout 2). There is an exemption to S4.2 with the power pins because this is a power-passthrough IC. It's purpose is to cut off power if the battery state exceeds certain specs. (Would be appropiate to define all the pins (except VDD) as passive?).

Datasheet: http://pingjingsemi.com/UploadFile/pdf/DW03.pdf

Layout option 1:

Layout option 2:

After submitting the PR I will look into any other things I might've missed in the tests. If there are any appropiate changes please let me know.

Thanks for all the work put into KiCad! :)