Address API review feedback

"Can the getters be made public so this can be CTS tested?"
"Please add getters and mark them @TestApi so CTS can use them."
"Antispoofkey and AntiSpoofkey should be AntispoofKey."
"please rename accountKey to something like deviceAccountKey"

Getters are added as SystemApi since @TestApi doesn't work well with mainline.

BUG: 218682005
BUG: 222489854
Test: unit test
Change-Id: Ia4cb720ac266e8e07650829a4d3473806e437522
15 files changed
tree: fb2730e9d14bab7e20bf1c303174062539ffe174
  1. nearby/