Add __version__ member to version.py

In order to improve compatibility with other version schemes, this alternative label for the version was added to the version file.

Author: Nicoretti

doc/changes/unreleased.md

@@ -2,6 +2,7 @@
 
 ## 🔧 Changed
 
+* Add `__version__` member to generated `version.py` for comatibility with other versions schemes
 * Excluded pyupgrade from project check due to its destructive nature
 * Updated cookiecutter template
     - removed obsolete template file `version.html`

exasol/toolbox/pre_commit_hooks/package_version.py

@@ -32,6 +32,7 @@
     MINOR = {minor}
     PATCH = {patch}
     VERSION = f"{{MAJOR}}.{{MINOR}}.{{PATCH}}"
+    __version__ = VERSION
 ''') + "\n"
 # fmt: on
 

exasol/toolbox/version.py

@@ -8,3 +8,4 @@
 MINOR = 18
 PATCH = 0
 VERSION = f"{MAJOR}.{MINOR}.{PATCH}"
+__version__ = VERSION