SavedStruct: Introduce saved_struct_get_metadata #3392

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Task	Status
All 3 parameters became optional, as the user might not necessarily care about them all.	Incomplete
The functionality of `saved_struct_get_payload_size` is entirely superseded, so I felt like it's appropriate to replace it instead of adding a new API call.	Incomplete
`saved_struct_save` gets its `data` parameter const-qualified. This change needs no further explanation, and since I bumped up the API version with the other change anyway, I went for it. I also const-qualified all the functions in other modules that exclusively called `saved_struct_save`.	Incomplete
PR has description of feature/bug or link to Confluence/Jira task	Completed
Description contains actions to verify feature/bugfix	Completed
I've built this code, uploaded it to the device and verified feature/bugfix	Completed