stubs/pyfakef, stubs/pytest_subprocess: Add stubs for test_pci.py

Add stubs which allow using static analysis without import errors.

Signed-off-by: Bernhard Kaindl <bernhard.kaindl@cloud.com>

Author: bernhardkaindl

stubs/pyfakefs/__init__.pyi

@@ -0,0 +1,2 @@
+from _typeshed import Incomplete
+Patcher = Incomplete

stubs/pyfakefs/fake_filesystem_unittest.pyi

@@ -0,0 +1,35 @@
+from .process_recorder import ProcessRecorder as ProcessRecorder
+from .types import COMMAND as COMMAND, OPTIONAL_TEXT_OR_ITERABLE as OPTIONAL_TEXT_OR_ITERABLE
+from .utils import Any as Any, Command as Command, Program as Program
+from _typeshed import Incomplete
+from typing import Any as AnyType, Callable, ClassVar, Dict, List, Optional, Type
+
+class FakeProcess:
+    any: ClassVar[Type[Any]]
+    program: ClassVar[Type[Program]]
+    definitions: Incomplete
+    calls: Incomplete
+    exceptions: Incomplete
+    def __init__(self) -> None: ...
+    def register(
+        self,
+        command: COMMAND,
+        stdout: OPTIONAL_TEXT_OR_ITERABLE = ...,
+        stderr: OPTIONAL_TEXT_OR_ITERABLE = ...,
+        returncode: int = ...,
+        wait: Optional[float] = ...,
+        # callback: Optional[Callable] = ...,
+        callback_kwargs: Optional[Dict[str, AnyType]] = ...,
+        # signal_callback: Optional[Callable] = ...,
+        occurrences: int = ...,
+        # stdin_callable: Optional[Callable] = ...,
+    ) -> ProcessRecorder: ...
+    register_subprocess = register
+    def pass_command(self, command: COMMAND, occurrences: int = ...) -> None: ...
+    def __enter__(self) -> "FakeProcess": ...
+    def __exit__(self, *args: List[Any], **kwargs: Dict[str, Any]) -> None: ...
+    def allow_unregistered(self, allow: bool) -> None: ...
+    def call_count(self, command: COMMAND) -> int: ...
+    def keep_last_process(self, keep: bool) -> None: ...
+    @classmethod
+    def context(cls) -> "FakeProcess": ...