Add metadata files for tinytemplate. am: 3426ef7341 am: 508e176354 am: 17b8c78010 am: 447d16d3a7

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tinytemplate/+/1622422

Change-Id: I7eac99e14fd52aff9faede6f6b49507a78a65f19