Add grunt-jsonlint and grunt-banana-checker

Authored by Umherirrender on Mon, Mar 20, 7:28 PM.

Description

Add grunt-jsonlint and grunt-banana-checker

jsonlint and banana-checker will test for valid i18n files

Bug: T94547
Change-Id: Ia6e4adfde55c069e2eabba1195c0387f25a52833