Add metadata files for regex-automata. am: 35e48d359e am: 43fea11f5e am: fe0701414b am: cc61687743

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/regex-automata/+/1621087

Change-Id: I3ed8cc59a934ea1cbe512511bb0288b948e4fdd1