Add ON Semi NIS5420T1 and derivative efuses

Hello,

I've added the symbols for ON Semi NIS5420 w/ Isense pin.

Datasheet: https://www.onsemi.com/pdf/datasheet/nis5420-d.pdf

Matching footprint MR: kicad-footprints!2888 (merged)

• Remove the instructional content of this template
• Provide a URL to a datasheet for the symbol(s) you are contributing
• An example screenshot image is very helpful
• Ensure that the associated footprints match the official footprint library
  • A new fitting footprint must be submitted if the library does not yet contain one.
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.