Replace deprecated pkg_resources with importlib.metadata

Fixes deprecation warning about pkg_resources being slated for removal.
Uses importlib.metadata (Python 3.8+) with fallback to importlib_metadata
for older Python versions to maintain backward compatibility.

Author: zachtheyek

blimpy/__init__.py

@@ -18,9 +18,13 @@
 except:
     print("Warning: At least one utility could not be imported!")
 
-from pkg_resources import get_distribution, DistributionNotFound
+try:
+    from importlib.metadata import version, PackageNotFoundError
+except ImportError:
+    # Fallback for Python < 3.8
+    from importlib_metadata import version, PackageNotFoundError
 
 try:
-    __version__ = get_distribution('blimpy').version
-except DistributionNotFound:
+    __version__ = version('blimpy')
+except PackageNotFoundError:
     __version__ = '0.0.0 - please install via pip/setup.py'