console: Add console subsystem Change-Id: I2aeead9ecb7cb9fbf5a223d680eb41e6c175d706 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/maize/+/259333 Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com> Reviewed-by: Travis Geiselbrecht <travisg@google.com> Commit-Queue: Erik Gilling <konkers@google.com>