types: add initial infrastructure for function serialization

 - Introduce a new "program" entity which holds the list of functions
   created during compilation

 - Instead of storing pointers to the in-memory function representation
   in the constant list, store the index of the function within the
   program's function list

 - When loading functions from the constant list, retrieve the function
   by index from the program entity

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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