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

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

Change-Id: Ic63cab5f2615ef9e69cf9675ffcbf81b2bdd9dc7