Import speed refactoring

Moves heavy imports inside functions, to speed up the start time

docs/releases.md

@@ -9,6 +9,10 @@ As the library is still in its early development stages, **there may be breaking
 
 And remember to keep your pip installation [up to date](/qim3d/#upgrade) so that you have the latest features!
 
+### v0.3.7 (17/06/2024)
+- Performance improvements when importing 
+- Refactoring for blob detection
+
 ### v0.3.6 (30/05/2024)
 - Refactoring for performance improvement
 - Welcome message for the CLI