[Sema] Suggest missing format attributes (#166738)
Implements the `-Wmissing-format-attribute` diagnostic as a subgroup of
`-Wformat-nonliteral`. It suggests adding format attributes to function
declarations that call other format functions and pass the format string
to them.
This is an updated implementation of #105479.
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Co-authored-by: Budimir Arandjelovic <budimir.arandjelovic@htecgroup.com>
