Extend wrong_serialize_struct_arg to handle serialize_struct_variant, etc.

[smoelius]

wrong_serialize_struct_arg is here: https://github.com/trailofbits/dylint/tree/master/examples/general/wrong_serialize_struct_arg

Additional methods it might handle are the following:

• serialize_struct_variant
• serialize_tuple
• serialize_tuple_struct
• serialize_tuple_variant

The ones that are not serialize_tuple should be straightforward, as they also involve calls to serialize_field. The main changes should be:

• Changing the path that is checked for:

  dylint/examples/general/wrong_serialize_struct_arg/src/lib.rs

  Line 125 in d75ae91

  if match_def_path(cx, method_def_id, &paths::SERDE_SERIALIZE_STRUCT)

• Changing how the len argument is extracted:

  dylint/examples/general/wrong_serialize_struct_arg/src/lib.rs

  Lines 126 to 127 in d75ae91

  	&& let [_, arg] = args
  	&& let Some(Constant::Int(len)) = constant(cx, cx.typeck_results(), arg)

• Adjusting the diagnostic message:

  dylint/examples/general/wrong_serialize_struct_arg/src/lib.rs

  Lines 103 to 106 in d75ae91

  	format!(
  	"`serialize_struct` call's `len` argument is {len}, but number of \
  	`serialize_field` calls is {n}"
  	),

Handling serialize_tuple will be slightly more involved, as it requires counting calls to serialize_element instead of serialize_field.