fs: move GitFileSystem out of dvc.objects.fs

This is more of a DVC thing than objects.

dvc/fs/__init__.py

@@ -4,7 +4,6 @@ from dvc.objects.fs import (  # noqa: F401
     FS_MAP,
     AzureFileSystem,
     GDriveFileSystem,
-    GitFileSystem,
     GSFileSystem,
     HDFSFileSystem,
     HTTPFileSystem,
@@ -37,4 +36,8 @@ from dvc.objects.fs.implementations.ssh import (  # noqa: F401
 )
 from dvc.objects.fs.path import Path  # noqa: F401
 
+from .data import DataFileSystem  # noqa: F401
+from .dvc import DvcFileSystem  # noqa: F401
+from .git import GitFileSystem  # noqa: F401
+
 # pylint: enable=unused-import

dvc/fs/git.py

@@ -3,7 +3,7 @@ from typing import TYPE_CHECKING, Any
 
 from funcy import cached_property, wrap_prop
 
-from ..base import FileSystem
+from . import FileSystem
 
 if TYPE_CHECKING:
     from scmrepo.fs import GitFileSystem as FsspecGitFileSystem

dvc/objects/fs/__init__.py

@@ -5,7 +5,6 @@ from dvc.scheme import Schemes
 from . import generic  # noqa: F401
 from .implementations.azure import AzureFileSystem
 from .implementations.gdrive import GDriveFileSystem
-from .implementations.git import GitFileSystem  # noqa: F401
 from .implementations.gs import GSFileSystem
 from .implementations.hdfs import HDFSFileSystem
 from .implementations.http import HTTPFileSystem