feat: add __version__ alias to bigframes.pandas (#967)

* add new alias '__version__'

* remove accidental changes

* correct assignment

---------

Co-authored-by: Tim Sweña (Swast) <swast@google.com>

Author: rey-esp

bigframes/functions/_remote_function_session.py

@@ -387,7 +387,7 @@ def wrapper(func):
                 # https://docs.python.org/3/library/inspect.html#inspect.signature
                 signature_kwargs: Mapping[str, Any] = {"eval_str": True}
             else:
-                signature_kwargs = {}
+                signature_kwargs = {}  # type: ignore
 
             signature = inspect.signature(
                 func,

bigframes/pandas/__init__.py

@@ -69,6 +69,7 @@
 import bigframes.session
 import bigframes.session._io.bigquery
 import bigframes.session.clients
+import bigframes.version
 
 try:
     import resource
@@ -838,6 +839,7 @@ def clean_up_by_session_id(
 Index = bigframes.core.indexes.Index
 MultiIndex = bigframes.core.indexes.MultiIndex
 Series = bigframes.series.Series
+__version__ = bigframes.version.__version__
 
 # Other public pandas attributes
 NamedAgg = namedtuple("NamedAgg", ["column", "aggfunc"])
@@ -911,6 +913,7 @@ def reset_session():
     "Index",
     "MultiIndex",
     "Series",
+    "__version__",
     # Other public pandas attributes
     "NamedAgg",
     "options",