Dialect: Fix SQLAlchemy dialect entrypoint

The dialect as designated by the `crate` dialect identifier was still
pointing to the `crate` package. Now, it is assigned to this one
instead.

Author: amotl

docs/install.rst

@@ -28,7 +28,7 @@ After that is done, you can import the library, like so:
 
 .. code-block:: python
 
-    >>> from sqlalchemy_cratedb import CrateDialect
+    >>> from sqlalchemy_cratedb import dialect
 
 Set up as a dependency
 ======================

pyproject.toml

@@ -121,7 +121,7 @@ documentation = "https://github.com/crate-workbench/sqlalchemy-cratedb"
 homepage = "https://github.com/crate-workbench/sqlalchemy-cratedb"
 repository = "https://github.com/crate-workbench/sqlalchemy-cratedb"
 [project.entry-points."sqlalchemy.dialects"]
-crate = "sqlalchemy_cratedb:CrateDialect"
+crate = "sqlalchemy_cratedb:dialect"
 
 [tool.black]
 line-length = 100

src/sqlalchemy_cratedb/__init__.py

@@ -20,7 +20,7 @@
 # software solely pursuant to the terms of the relevant commercial agreement.
 
 from .compat.api13 import monkeypatch_add_exec_driver_sql
-from .dialect import CrateDialect
+from .dialect import dialect
 from .predicate import match
 from .sa_version import SA_1_4, SA_2_0, SA_VERSION
 from .support import insert_bulk
@@ -50,7 +50,7 @@
 
 
 __all__ = [
-    CrateDialect,
+    dialect,
     Geopoint,
     Geoshape,
     ObjectArray,

src/sqlalchemy_cratedb/dialect.py

@@ -367,3 +367,6 @@ def has_ilike_operator(self):
 class DateTrunc(functions.GenericFunction):
     name = "date_trunc"
     type = sqltypes.TIMESTAMP
+
+
+dialect = CrateDialect