build: set automatic versioning in-package (__version__

Author: pabloitu

floatcsep/__init__.py

@@ -5,4 +5,10 @@
 from floatcsep.utils import readers, accessors, helpers
 from floatcsep.postprocess import reporting, plot_handler
 
-__version__ = "0.1.4"
+from importlib.metadata import version, PackageNotFoundError
+
+
+try:
+    __version__ = version("floatcsep")
+except PackageNotFoundError:
+    __version__ = "0.0.0"