Import 'maplit' crate

Request Document: go/android-rust-importing-crates
For CL Reviewers: go/android3p#cl-review
For Build Team: go/ab-third-party-imports
Bug: 374957872
Test: m libmaplit

Change-Id: I3b375d91852ab9ec97d36dfca93d1450478f4365
13 files changed