[apps/external] Add python external app support

[Yaya-Cout]

This pull request will add Python external apps.
It's work in progress :

• Use namespaces for Python env
• Add console view (for errors, prints and inputs)
• Use Kandinsky to display (fix python app's Kandinsky)
• Add menu to execute or copy to RAM
• Execute using a better way than exec(open('filename.py','r').read()) (MicroPython's runcode)

[github-actions]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	821588 bytes	478157 bytes	226384 bytes	1816 bytes	228200 bytes	1301561 bytes
Head	821996 bytes	478221 bytes	226376 bytes	1816 bytes	228192 bytes	1302033 bytes
	+408 bytes	+64 bytes	-8 bytes	+0 bytes	-8 bytes	+472 bytes
	+0.0 %	+0.0 %	-0.0 %	+0.0 %	-0.0 %	+0.0 %