[Python] Add classes in the function category

[yannis300307]

Add classes in the Python toolbox and rename to functions and classes.

Add the feature from #2216

[HugoNumworks]

Thanks for this contribution too, as I said in your other PR, we'll review it with product team and I'll keep you updated.

[github-actions]

Binary size analysis

	Flash in bytes			RAM in bytes
	.text	.rodata	.data	.bss	.data
Base	1 011 228	511 497	80	175 308	80
Head	1 011 228	511 889	80	175 308	80
	+ 392			+ 0

Full details

Apps

	App				Snapshot
	Base	Head	Delta		Base	Head	Delta
Calculation	23 928	23 928			18 804	18 804
Code	28 956	28 956			4	4
Distributions	11 652	11 652			120	120
Elements	4 496	4 496			12	12
Finance	11 776	11 776			120	120
Graph	44 416	44 416			3 512	3 512
Inference	39 256	39 256			1 592	1 592
Regression	25 504	25 504			1 456	1 456
Sequence	35 408	35 408			976	976
Settings	9 976	9 976			4	4
Solver	17 048	17 048			4	4
Statistics	26 384	26 384			1 376	1 376

N0110

		.text	.rodata	.bss	.data
Base	userland.onboarding.beta.allow3rdparty.A.elf	1 011 228	511 497	175 308	80
Head	userland.onboarding.beta.allow3rdparty.A.elf	1 011 228	511 889	175 308	80

[HugoNumworks]

Sorry, I'm closing this PR following #2216 (comment).
Thanks again for this contribution !