Initial mypy config

.github/workflows/check-type-hints.yml

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+name: Check type hints
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  mypy:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.9
+      - run: pip install mypy
+      - run: mypy --install-types --non-interactive --explicit-package-bases @mypy_modules.txt

mypy.ini

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+[mypy]
+python_version = 3.9
+
+# Check configuration
+warn_unused_configs = True
+warn_redundant_casts = True
+
+# Type checking
+disallow_any_generics = True
+check_untyped_defs = True
+warn_unused_ignores = True
+warn_return_any = True
+strict_equality = True
+
+# Parse but don't check imported libraries
+follow_imports = silent
+ignore_missing_imports = True
+
+# Reporting
+pretty = True

mypy_modules.txt

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+corehq/apps/app_manager/xform_builder.py
+corehq/apps/case_search/xpath_functions/subcase_functions.py
+corehq/apps/commtrack/fixtures.py
+corehq/apps/domain/tests/test_forms.py
+corehq/apps/es/tests/test_elastic_sync_multiplexed_command.py
+corehq/apps/events/tests/test_tasks.py
+corehq/apps/linked_domain/tests/test_migrate_feature_flag_domains.py
+corehq/apps/reports/tests/test_case_data.py
+corehq/apps/sms/forms.py
+corehq/apps/userreports/models.py
+corehq/apps/userreports/tests/test_data_source_config.py
+corehq/apps/users/management/commands/add_data_dict_permissions.py
+corehq/messaging/smsbackends/twilio/forms.py
+corehq/messaging/smsbackends/twilio/models.py
+corehq/motech/serializers.py
+custom/onse/models.py