Migrate base64 to crate monorepo.

For realsies.

Test: treehugger
Bug: 339424309
Change-Id: Ia4e7dc4eedfe6ccd8b368a07a6536109f69111af
76 files changed
tree: 4c317555fb606bbca6bc53d34b73a777860d8218
  1. crates/
  2. pseudo_crate/
  3. METADATA
  4. OWNERS
  5. PREUPLOAD.cfg