chore: allow use of bitmap_label without bitmaptools

in some cases, bitmaptools may not even be used - such as when
displayio.Bitmap supports blit.  in others, the module can run
without bitmaptools as it has a fallback which works even if
it's slower

Author: imnotjames

adafruit_display_text/bitmap_label.py

@@ -27,9 +27,14 @@
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_Display_Text.git"
 
 import displayio
-import bitmaptools
 from adafruit_display_text import LabelBase
 
+try:
+    import bitmaptools
+except ImportError:
+    # We have a slower fallback for bitmaptools
+    pass
+
 try:
     from typing import Optional, Tuple
     from fontio import FontProtocol