PR: Update mypy annotations

[edreamleo]

This PR suggests suppressing and updating annotations in stages:

• Stage 1: Add annotations and # type:ignore comments to eliminate all mypy complaints.
  • Backport the fix for Fix a valid mypy complaint #662.
• Stage 2: Add annotations for args such as pyfunction, pymodule, pyobject and scope.
• Stage 3: Remove most # type:ignore comments.
  • Allow # type:ignore comments for optional import statements.
  • For now, skip mypy checking for type_hinting/evaluate.py, prefs.py and versioning.py.
• Stage 4: Require full annotations for important type inference files.
  • Remove most Any annotations.
• Stage 5: (Optional) Require full annotations for all (most?) files in rope.base.

Valid mypy complaints

The following complaints suggest real errors in Rope:

• MoveGlobal.get_changes: "Resource" has no attribute "has_child"/ "get_child".
• _GlobalUnboundNameFinder.__init__: "PyObject" has no attribute "get_scope".
• AutoImport._get_python_folders:
  error: Incompatible types in assignment
  (expression has type "filter[Path]", variable has type "map[Path]")

[edreamleo]

Fixed at Rev e121c8f.

[edreamleo]

@lieryan I am going to close this PR.

I'll use ekr-fork-rope2 to work on the Theory of Operation without bothering you.