refactor: improve code formatting and structure in core modules

- Format firecracker/microvm.py with ruff for consistency
- Update network.py and utils.py with code style improvements
- Add _version.py module for version tracking
- Improve error handling and validation in MicroVM class
- Enhance snapshot loading with better error messages and recovery

Author: restuhaqza

firecracker/_version.py

@@ -0,0 +1,34 @@
+# file generated by setuptools-scm
+# don't change, don't track in version control
+
+__all__ = [
+    "__version__",
+    "__version_tuple__",
+    "version",
+    "version_tuple",
+    "__commit_id__",
+    "commit_id",
+]
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Tuple
+    from typing import Union
+
+    VERSION_TUPLE = Tuple[Union[int, str], ...]
+    COMMIT_ID = Union[str, None]
+else:
+    VERSION_TUPLE = object
+    COMMIT_ID = object
+
+version: str
+__version__: str
+__version_tuple__: VERSION_TUPLE
+version_tuple: VERSION_TUPLE
+commit_id: COMMIT_ID
+__commit_id__: COMMIT_ID
+
+__version__ = version = '0.0.post129+gcc985963c.d20260127'
+__version_tuple__ = version_tuple = (0, 0, 'post129', 'gcc985963c.d20260127')
+
+__commit_id__ = commit_id = 'gcc985963c'