Make autocomplete faster

Autocompleting the commands was insanely slow.  Putting imports
inside the commands helped.  I got the idea from this issue:
fastapi/typer#231

src/beaverdam/cli/cli.py

@@ -1,19 +1,22 @@
 import typer
 
-from beaverdam.builder import build_database
-from beaverdam.viewer import run_ui
-
-# Create subcommand apps
-# build = typer.Typer()
-# view = typer.Typer()
 
 # Create main app
+
 app = typer.Typer()
 
+# Add commands for each functionality
+
+
 @app.command()
 def build(config_file_name):
+    from beaverdam.builder import build_database
+
     build_database(config_file_name)
 
+
 @app.command()
 def view(config_file_name):
-    run_ui(config_file_name)
+    from beaverdam.viewer import run_ui
+
+    run_ui(config_file_name)