[riot-notifications] [RIOT-OS/RIOT] Feat/add flashwrite APIs (#15511)

[Francisco]

> Also have you taken a look at out Commit conventions? Would you min taking a look to reformat the commits? I think here you could have 2 commits:
> 
>     the one adding the new api functions
>     the one fixing the unused image_size

We would deal with this at the end of the review of course, please consider taking a look at the whole [Contributing Guidleines](https://github.com/miri64/RIOT/blob/master/CONTRIBUTING.md#contributing-to-riot) :)

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