[ty] Todo-types for os.fdopen, NamedTemporaryFile, and Path.open (#20549)

## Summary

This applies the trick that we use for `builtins.open` to similar
functions that have the same problem. The reason is that the problem
would otherwise become even more pronounced once we add understanding of
the implicit type of `self` parameters, because then something like
`(base_path / "test.bin").open("rb")` also leads to a wrong return type
and can result in false positives.

## Test Plan

New Markdown tests

crates/ty_python_semantic/src/module_resolver/module.rs

@@ -318,6 +318,9 @@ pub enum KnownModule {
     TypingExtensions,
     Typing,
     Sys,
+    Os,
+    Tempfile,
+    Pathlib,
     Abc,
     Dataclasses,
     Collections,
@@ -347,6 +350,9 @@ impl KnownModule {
             Self::Typeshed => "_typeshed",
             Self::TypingExtensions => "typing_extensions",
             Self::Sys => "sys",
+            Self::Os => "os",
+            Self::Tempfile => "tempfile",
+            Self::Pathlib => "pathlib",
             Self::Abc => "abc",
             Self::Dataclasses => "dataclasses",
             Self::Collections => "collections",