Integrate setuptools_scm

Integrated automatic version information generation using `setuptools_scm` in `pyproject.toml` file.
Since the example package doesn't contain any source files, it's currently a bit hard to test if versioning works correctly.

.gitignore

@@ -6,6 +6,9 @@ dist/*
 coverage.xml
 htmlcov/*
 
+# Setuptools SCM
+map/_version.py
+
 # IDE configuration
 .vscode
 .idea

pyproject.toml

 [build-system]
-requires = ['setuptools>=42', 'wheel']
-build-backend = 'setuptools.build_meta'
+requires = [
+    "setuptools>=45",
+    "setuptools_scm[toml]>=6.2",
+    "wheel"
+]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools_scm]
+write_to = "map/_version.py"
+
+[tool.pylint]
+ignore = "_version.py"