expose dvcfs in dvc.api and add to fsspec's registry (#8287)

* expose dvcfs in dvc.api and add to fsspec's registry

* readd __all__ to avoid exposing modules

dvc/api/__init__.py

@@ -1,9 +1,15 @@
-from .data import (  # noqa, pylint: disable=redefined-builtin
-    get_url,
-    open,
-    read,
-)
+from dvc.fs.dvc import _DvcFileSystem as DvcFileSystem
+
+from .data import open  # pylint: disable=redefined-builtin
+from .data import get_url, read
 from .experiments import make_checkpoint
 from .params import params_show
 
-__all__ = ["get_url", "make_checkpoint", "open", "params_show", "read"]
+__all__ = [
+    "get_url",
+    "make_checkpoint",
+    "open",
+    "params_show",
+    "read",
+    "DvcFileSystem",
+]

setup.cfg

@@ -146,6 +146,8 @@ exclude =
 [options.entry_points]
 console_scripts =
     dvc = dvc.cli:main
+fsspec.specs =
+    dvc = dvc.api:DvcFileSystem
 
 [flake8]
 ignore=