[BE] add type annotations and run mypy on setup.py (pytorch#156741)

Pull Request resolved: pytorch#156741
Approved by: https://github.com/aorenste

Author: XuehaiPan

.lintrunner.toml

@@ -122,6 +122,7 @@ is_formatter = true
 [[linter]]
 code = 'MYPY'
 include_patterns = [
+    'setup.py',
     'torch/**/*.py',
     'torch/**/*.pyi',
     'caffe2/**/*.py',

Makefile

@@ -57,17 +57,15 @@ setup-env-cuda:
 setup-env-rocm:
 	$(MAKE) setup-env PYTHON="$(PYTHON)" NIGHTLY_TOOL_OPTS="$(NIGHTLY_TOOL_OPTS) --rocm"
 
-.lintbin/.lintrunner.sha256: requirements.txt pyproject.toml .lintrunner.toml
+.PHONY: setup-lint
+setup-lint .lintbin/.lintrunner.sha256: requirements.txt pyproject.toml .lintrunner.toml
 	@echo "Setting up lintrunner..."
 	$(PIP) install lintrunner
 	lintrunner init
 	@echo "Generating .lintrunner.sha256..."
 	@mkdir -p .lintbin
 	@sha256sum requirements.txt pyproject.toml .lintrunner.toml > .lintbin/.lintrunner.sha256
 
-.PHONY: setup-lint
-setup-lint: .lintbin/.lintrunner.sha256
-
 .PHONY: lazy-setup-lint
 lazy-setup-lint: .lintbin/.lintrunner.sha256
 	@if [ ! -x "$(shell command -v lintrunner)" ]; then \