Pao/generic clear signing mvp

[fbeutin-ledger]

For ease of review

[github-actions]

elf sizes
source = source branch pao/generic_clear_signing_mvp
target = target branch fbe/generic_clear_signing_mvp

Device	.text source	.text target	.text delta	.bss source	.bss target	.bss delta	max stack size source	max stack size target	max stack size delta
flex	130334	129822	512	22626	22626	0	14228	14228	0
stax	129793	129281	512	22626	22626	0	14228	14228	0
apex_p	125576	125064	512	22626	22626	0	18324	18324	0
nanox	99668	99412	256	21356	21356	0	8192	8192	0
nanos2	99924	99412	512	21328	21328	0	19624	19624	0

Stack consumption summary

⚠️ This summary is for informative purpose only. It may not give the application actual worst case, for example if the test coverage is low.

Device	Worst case (bytes)	Remaining stack (bytes)	Test
apex_p	2057	16267	test_spl_tokens.py::TestToken2022::test_token_2022_create[apex_p]
flex	2057	12171	test_spl_tokens.py::TestToken2022::test_token_2022_create[flex]
nanosp	2049	17575	test_spl_tokens.py::TestToken2022::test_token_2022_create[nanosp]
nanox	2049	5259	test_spl_tokens.py::TestToken2022::test_token_2022_create[nanox]
stax	2057	12171	test_spl_tokens.py::TestToken2022::test_token_2022_create[stax]

Full details