Rethink type the way arguments of mock functions are handled

[c8y3]

Type mock_argument_t is generic. It is not appropriate to store va_list parameters.
When we store parameters, we have lost the type. We should do something earlier, maybe some macro magic.
There is a aum_parameter_type in aum/assert.h and also in aum/mock.h, they should be unified.
Maybe we need to store the type as a string and parse it ? Maybe we should convert the type into a structure with all the function pointers appropriate to handle the type, as soon as possible in the code.
Anyway, as of today, this is hacky.
Also, I am not really happy that the user has to specify AUM_PARAMETER_STRING or AUM_PARAMETER_RAW when using AUM_ASSERT_WAS_CALLED_WITH.

[c8y3]

Since, we know the mock arguments type, it should not be necessary for the user to specify them again when doing its assert with aum_mock_was_called_with. Look, how the code of aum_mock_was_called_with could depend on an information stored with the mock.