Provide API for printing the debug level as a string.

[aentinger]

This fixes #7.

[github-actions]

Memory usage change @ 94b3d50

Board	flash	%	RAM for global variables	%
arduino:avr:leonardo	🔺 +44 - +44	+0.15 - +0.15	🔺 +17 - +17	+0.66 - +0.66
arduino:avr:mega	🔺 +42 - +44	+0.02 - +0.02	🔺 +15 - +15	+0.18 - +0.18
arduino:avr:nano	🔺 +42 - +44	+0.14 - +0.14	🔺 +15 - +15	+0.73 - +0.73
arduino:mbed_nano:nano33ble	🔺 +96 - +96	+0.01 - +0.01	0 - 0	0.0 - 0.0
arduino:mbed_nano:nanorp2040connect	🔺 +40 - +40	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed_portenta:envie_m4	🔺 +160 - +160	+0.02 - +0.02	0 - 0	0.0 - 0.0
arduino:mbed_portenta:envie_m7	🔺 +160 - +160	+0.02 - +0.02	0 - 0	0.0 - 0.0
arduino:megaavr:nona4809	🔺 +43 - +45	+0.09 - +0.09	🔺 +1 - +1	+0.02 - +0.02
arduino:sam:arduino_due_x_dbg	🔺 +136 - +136	+0.03 - +0.03	N/A	N/A
arduino:samd:mkrzero	🔺 +136 - +136	+0.05 - +0.05	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/Arduino_Debug_Basic flash	%	examples/Arduino_Debug_Basic RAM for global variables	%	examples/Arduino_Debug_Advance flash	%	examples/Arduino_Debug_Advance RAM for global variables	%
arduino:avr:leonardo	44	0.15	17	0.66	44	0.15	17	0.66
arduino:avr:mega	44	0.02	15	0.18	42	0.02	15	0.18
arduino:avr:nano	44	0.14	15	0.73	42	0.14	15	0.73
arduino:mbed_nano:nano33ble	96	0.01	0	0.0
arduino:mbed_nano:nanorp2040connect	40	0.0	0	0.0
arduino:mbed_portenta:envie_m4	160	0.02	0	0.0
arduino:mbed_portenta:envie_m7	160	0.02	0	0.0
arduino:megaavr:nona4809	45	0.09	1	0.02	43	0.09	1	0.02
arduino:sam:arduino_due_x_dbg	136	0.03	N/A	N/A
arduino:samd:mkrzero	136	0.05	0	0.0

Click for full report CSV

Board,examples/Arduino_Debug_Basic<br>flash,%,examples/Arduino_Debug_Basic<br>RAM for global variables,%,examples/Arduino_Debug_Advance<br>flash,%,examples/Arduino_Debug_Advance<br>RAM for global variables,%
arduino:avr:leonardo,44,0.15,17,0.66,44,0.15,17,0.66
arduino:avr:mega,44,0.02,15,0.18,42,0.02,15,0.18
arduino:avr:nano,44,0.14,15,0.73,42,0.14,15,0.73
arduino:mbed_nano:nano33ble,96,0.01,0,0.0,,,,
arduino:mbed_nano:nanorp2040connect,40,0.0,0,0.0,,,,
arduino:mbed_portenta:envie_m4,160,0.02,0,0.0,,,,
arduino:mbed_portenta:envie_m7,160,0.02,0,0.0,,,,
arduino:megaavr:nona4809,45,0.09,1,0.02,43,0.09,1,0.02
arduino:sam:arduino_due_x_dbg,136,0.03,N/A,N/A,,,,
arduino:samd:mkrzero,136,0.05,0,0.0,,,,