[third_party][rust] Add ansi_term to Cargo.*

vendor/ansi_term already existed. This CL brings in the usability.
Cargo.toml is manually modified.
Cargo.lock is done by fx update-rustc-third-party

Test: fx full-build
Change-Id: I7b89cd1a33f49cfa7f3b1bdec989cc5eae445255