formatter (and parser?) ambiguity with nested parameteric function invocation

**Describe the bug**

It seems that the formatter (and possibly) the parser have issues resolving the ambiguities w/ nested parametrics function invocation.

**To Reproduce**

I've seen it w/ `assert_eq`, ex:
```
assert_eq(function_name(some_param, another_param), some_expected_result);
```

That get formatted as:
```
assert_eq(
function_name < SOME_CONST, some_module::SOME_CONST_STRUCT.some_field > (some_param, another_param),
some_expected_result);
```
and treat the parametric function invocation as 3 parameters to `assert_eq`
- `function_name < SOME_CONST`: comparison between two scalar
- `some_module::SOME_CONST_STRUCT.some_field > (some_param, another_param)`: comparison between a scalar and a tuple
- `some_expected_result`

The interpreter also throw:
```
`function_name` is parametric function, but it is not being invoked
```
or
```
TypeInferenceError: Cannot use operator `<` on functions
```