Add metadata files for csv-core. am: 4cb706314e am: 46a8c5d7d7 am: 2545962d51

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/csv-core/+/1621402

Change-Id: I540f0ad4a045e4c3e58e92e93e696cc98e0a4afb