pw_console: Add styles and key bindings

This adds the necessary prompt_toolkit boiler plate for some barebones
colors styles and key bindings.

No-Docs-Update-Reason: prompt_toolkit UI boilerplate
Change-Id: I29b5a7f82bbc412f3ada3a52bebefa1576136704
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48766
Pigweed-Auto-Submit: Anthony DiGirolamo <tonymd@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Keir Mierle <keir@google.com>
Reviewed-by: Joe Ethier <jethier@google.com>
diff --git a/pw_console/py/BUILD.gn b/pw_console/py/BUILD.gn
index f8952f1..e6b2848 100644
--- a/pw_console/py/BUILD.gn
+++ b/pw_console/py/BUILD.gn
@@ -22,6 +22,8 @@
     "pw_console/__init__.py",
     "pw_console/__main__.py",
     "pw_console/console_app.py",
+    "pw_console/key_bindings.py",
+    "pw_console/style.py",
   ]
   tests = [ "console_app_test.py" ]
   python_deps = [