refactor: remove circular dependencies preventing local doctest runs (#987)

With this change I can once again run

```
pytest --doctest-modules third_party/bigframes_vendored/pandas/core/frame.py
```

Note: having multiple `version.py` files should be fine. release-please
will update all such files it finds.

Author: tswast

bigframes/bigquery/__init__.py

@@ -23,7 +23,8 @@
 import typing
 from typing import Literal, Optional, Union
 
-import bigframes.constants as constants
+import bigframes_vendored.constants as constants
+
 import bigframes.core.groupby as groupby
 import bigframes.core.sql
 import bigframes.ml.utils as utils

bigframes/constants.py

@@ -19,14 +19,6 @@
 
 import datetime
 
-import bigframes_vendored.constants
-
-BF_VERSION = bigframes_vendored.constants.BF_VERSION
-FEEDBACK_LINK = bigframes_vendored.constants.FEEDBACK_LINK
-ABSTRACT_METHOD_ERROR_MESSAGE = (
-    bigframes_vendored.constants.ABSTRACT_METHOD_ERROR_MESSAGE
-)
-
 DEFAULT_EXPIRATION = datetime.timedelta(days=7)
 
 # https://cloud.google.com/bigquery/docs/locations

bigframes/core/block_transforms.py

@@ -17,9 +17,10 @@
 import typing
 from typing import Sequence
 
+import bigframes_vendored.constants as constants
 import pandas as pd
 
-import bigframes.constants as constants
+import bigframes.constants
 import bigframes.core as core
 import bigframes.core.blocks as blocks
 import bigframes.core.expression as ex
@@ -117,7 +118,7 @@ def quantile(
     )
     quantile_cols = []
     labels = []
-    if len(columns) * len(qs) > constants.MAX_COLUMNS:
+    if len(columns) * len(qs) > bigframes.constants.MAX_COLUMNS:
         raise NotImplementedError("Too many aggregates requested.")
     for col in columns:
         for q in qs:

bigframes/core/blocks.py

@@ -32,13 +32,13 @@
 from typing import Iterable, List, Literal, Mapping, Optional, Sequence, Tuple, Union
 import warnings
 
+import bigframes_vendored.constants as constants
 import google.cloud.bigquery as bigquery
 import pandas as pd
 import pyarrow as pa
 
 import bigframes._config.sampling_options as sampling_options
 import bigframes.constants
-import bigframes.constants as constants
 import bigframes.core as core
 import bigframes.core.compile.googlesql as googlesql
 import bigframes.core.expression as ex

bigframes/core/compile/aggregate_compiler.py

@@ -15,13 +15,13 @@
 import typing
 from typing import cast, Optional
 
+import bigframes_vendored.constants as constants
 import bigframes_vendored.ibis.expr.operations as vendored_ibis_ops
 import ibis
 import ibis.expr.datatypes as ibis_dtypes
 import ibis.expr.types as ibis_types
 import pandas as pd
 
-import bigframes.constants as constants
 import bigframes.core.compile.ibis_types as compile_ibis_types
 import bigframes.core.compile.scalar_op_compiler as scalar_compilers
 import bigframes.core.expression as ex

bigframes/core/compile/ibis_types.py

@@ -17,6 +17,7 @@
 from typing import Any, cast, Dict, Iterable, Optional, Tuple, Union
 import warnings
 
+import bigframes_vendored.constants as constants
 import bigframes_vendored.ibis.backends.bigquery.datatypes as third_party_ibis_bqtypes
 import bigframes_vendored.ibis.expr.operations as vendored_ibis_ops
 import geopandas as gpd  # type: ignore
@@ -29,7 +30,6 @@
 import pandas as pd
 import pyarrow as pa
 
-import bigframes.constants as constants
 import bigframes.dtypes
 
 # Type hints for Ibis data types supported by BigQuery DataFrame

bigframes/core/compile/scalar_op_compiler.py

@@ -17,6 +17,7 @@
 import functools
 import typing
 
+import bigframes_vendored.constants as constants
 import bigframes_vendored.ibis.expr.operations as vendored_ibis_ops
 import ibis
 import ibis.common.exceptions
@@ -26,7 +27,6 @@
 import numpy as np
 import pandas as pd
 
-import bigframes.constants as constants
 import bigframes.core.compile.ibis_types
 import bigframes.core.expression as ex
 import bigframes.dtypes

bigframes/core/groupby/__init__.py

@@ -17,10 +17,10 @@
 import typing
 from typing import Sequence, Union
 
+import bigframes_vendored.constants as constants
 import bigframes_vendored.pandas.core.groupby as vendored_pandas_groupby
 import pandas as pd
 
-import bigframes.constants as constants
 from bigframes.core import log_adapter
 import bigframes.core as core
 import bigframes.core.block_transforms as block_ops

bigframes/core/indexers.py

@@ -17,10 +17,10 @@
 import typing
 from typing import Tuple, Union
 
+import bigframes_vendored.constants as constants
 import ibis
 import pandas as pd
 
-import bigframes.constants as constants
 import bigframes.core.blocks
 import bigframes.core.expression as ex
 import bigframes.core.guid as guid

bigframes/core/indexes/base.py

@@ -19,12 +19,12 @@
 import typing
 from typing import Hashable, Optional, Sequence, Union
 
+import bigframes_vendored.constants as constants
 import bigframes_vendored.pandas.core.indexes.base as vendored_pandas_index
 import google.cloud.bigquery as bigquery
 import numpy as np
 import pandas
 
-import bigframes.constants as constants
 import bigframes.core.block_transforms as block_ops
 import bigframes.core.blocks as blocks
 import bigframes.core.expression as ex