pw_console: Add ReplPane class

No-Docs-Update-Reason: prompt_toolkit UI boilerplate
Change-Id: Ib284dac514a82a761abcbadf43235401540f1e99
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48803
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Anthony DiGirolamo <tonymd@google.com>
Reviewed-by: Joe Ethier <jethier@google.com>
diff --git a/pw_console/py/BUILD.gn b/pw_console/py/BUILD.gn
index d680a49..f6e54f0 100644
--- a/pw_console/py/BUILD.gn
+++ b/pw_console/py/BUILD.gn
@@ -24,6 +24,7 @@
     "pw_console/console_app.py",
     "pw_console/help_window.py",
     "pw_console/key_bindings.py",
+    "pw_console/repl_pane.py",
     "pw_console/style.py",
   ]
   tests = [