[red-knot] Rename *_ty functions (#15617)

## Summary

General rules:

* Change the `_ty` suffix of all functions to `_type`.
* `_type_and_qualifiers` suffixes seem too long, so we ignore the
existence of qualifiers and still speak of "types"
* Functions only have a `_type` suffix if they return either `Type`,
`Option<Type>`, or `TypeAndQualifiers`

Free functions:

* `binding_ty` => `binding_type`
* `declaration_ty` => `declaration_type`
* `definition_expression_ty` => `definition_expression_type`

Methods:

* `CallDunderResult::return_ty` => `return_type`
* `NotCallableError::return_ty` => `return_type`
* `NotCallableError::called_ty` => `called_type`
* `TypeAndQualifiers::inner_ty` => `inner_type`
* `TypeAliasType::value_ty` => `value_type`
* `TypeInference::expression_ty` => `expression_type`
* `TypeInference::try_expression_ty` => `try_expression_type`
* `TypeInference::binding_ty` => `binding_type`
* `TypeInference::declaration_ty` => `declaration_type` 
* `TypeInferenceBuilder::expression_ty` => `expression_type`
* `TypeInferenceBuilder::file_expression_ty` => `file_expression_type`
* `TypeInferenceBuilder::module_ty_from_name` => `module_type_from_name`
* `ClassBase::try_from_ty` => `try_from_type`
* `Parameter::annotated_ty` => `annotated_type`
* `Parameter::default_ty` => `default_type`
* `CallOutcome::return_ty` => `return_type`
* `CallOutcome::return_ty_result` => `return_type_result`
* `CallBinding::from_return_ty` => `from_return_type`
* `CallBinding::set_return_ty` => `set_return_type`
* `CallBinding::return_ty` => `return_type`
* `CallBinding::parameter_tys` => `parameter_types`
* `CallBinding::one_parameter_ty` => `one_parameter_type`
* `CallBinding::two_parameter_tys` => `two_parameter_types`
* `Unpacker::tuple_ty_elements` => `tuple_type_elements`
* `StringPartsCollector::ty` => `string_type`

Traits

* `HasTy` => `HasType`
* `HasTy::ty` => `inferred_type`

Test functions:

* `assert_public_ty` => `assert_public_type`
* `assert_scope_ty` => `assert_scope_type`

closes #15569

## Test Plan

—

crates/red_knot_python_semantic/src/lib.rs

@@ -10,7 +10,7 @@ pub use module_resolver::{resolve_module, system_module_search_paths, KnownModul
 pub use program::{Program, ProgramSettings, SearchPathSettings, SitePackages};
 pub use python_platform::PythonPlatform;
 pub use python_version::PythonVersion;
-pub use semantic_model::{HasTy, SemanticModel};
+pub use semantic_model::{HasType, SemanticModel};
 
 pub mod ast_node_ref;
 mod db;