Suppress warnings in bitmap_label

[Neradoc]

There are warnings printed in bitmap_label (but not label), if a glyph is missing, and if a glyph is clipped.
Those generate possibly unwanted "noise" to the REPL, it would be nice to silence them.

But I don't know if we'll want to: remove them or have an option to silence them or an option to display them, and if so, we likely want it to work on both types of labels.

[jposada202020]

I think that we could do something similar to this

https://github.com/adafruit/Adafruit_CircuitPython_DisplayIO_Layout/blob/64b75e12e56d5518aa662dce35711e36ce031856/adafruit_displayio_layout/widgets/cartesian.py#L80

Normally you would not find any trouble with the glyphs as the ascender/descender will be pretty standard across the letters , there are some exceptions fonts , and with the work done in #103 it was helpful for debugging/information purposes.

Depending on the font, there could be glyphs that are not present, this is more prevalent for not common characters, so it is to inform the user that the character that they want to display is not present in the font file.

all that to say that I am in favor of using the Verbose argument :)