(7/x) Move package version from setup.py to pyproject.toml

We now specify the package version in a single place: pyproject.toml so
it's not necessary to dynamically figure it out in setup.py.

Copped the new contents of __version__.py from the Poetry github issue
tracker here:

python-poetry/poetry#144 (comment)

Signed-off-by: Jesse Whitehouse <jesse.whitehouse@databricks.com>

dbt/adapters/databricks/__version__.py

@@ -1 +1,2 @@
-version: str = "1.6.1"
+import importlib.metadata
+__version__= importlib.metadata.version('dbt-databricks')

pyproject.toml

@@ -1,5 +1,6 @@
 [tool.poetry]
 name = "dbt-databricks"
+version = "1.6.1"
 description = "The Databricks adapter plugin for dbt"
 authors = ["Databricks <feedback@databricks.com>"]
 readme = "README.md"

setup.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-import os
 import sys
 
 
@@ -16,21 +15,8 @@
     sys.exit(1)
 
 
-# get this package's version from dbt/adapters/<name>/__version__.py
-def _get_plugin_version():
-    _version_path = os.path.join(this_directory, "dbt", "adapters", "databricks", "__version__.py")
-    try:
-        exec(open(_version_path).read())
-        return locals()["version"]
-    except IOError:
-        print("Failed to load dbt-databricks version file for packaging.", file=sys.stderr)
-        sys.exit(-1)
-
-
-package_version = _get_plugin_version()
 setup(
 
-    version=package_version,
     url="https://github.com/databricks/dbt-databricks",
     packages=find_namespace_packages(include=["dbt", "dbt.*"]),
     include_package_data=True,