Add public print method that takes va_list instead of a variable number of arguments

[pennam]

I was tryng to improve SE05X library and get rid of this buffer used only for debugging purpose. To this i wanted to reuse Arduino_DebugUtils library.

SE05X NXP internal library already has builtin debug macros and is written in C so i cannot directly call Arduino_DebugUtils.print function as macro substitution, but i need to create a wrapper CPP function with varargs that calls the Arduino_DebugUtils.print method.

What i've found out is that is not possible to call a function which takes a variable number of arguments and passes them to some other function (which takes a variable number of arguments) so the proposal to add a new method that takes va_list

Probably another option is to use a variadic function template or using __builtin_apply but i did not investigate them and i think the proposed option is more straightforward.

[github-actions]

Memory usage change @ 1cd099e

Board	flash	%	RAM for global variables	%
arduino:avr:mega	0 - 0	0.0 - 0.0	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:mega	0	0.0	0	0.0	0	0.0	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:mega,0,0.0,0,0.0,0,0.0,0,0.0

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