Add grunt-jsonlint and grunt-banana-checker

Authored by Umherirrender on Mon, Mar 20, 7:24 PM.

Description

Add grunt-jsonlint and grunt-banana-checker

jsonlint and banana-checker will test for valid i18n files

Bug: T94547
Change-Id: I112e1809c76288de890af2199bf232d4d5eda491