Run ShakeTune as an in-process Klipper module (#100)

* feat: Run ShakeTune as an in-process Klipper module
* feat: install shaketune dependencies to klipper venv
* refactor: replace print_with_c_locale with klipper console output with stdout fallback

shaketune/helpers/filemanager.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+# Common file management functions for the Shake&Tune package
+# Written by Frix_x#0161 #
+
+import os
+import time
+from pathlib import Path
+
+
+def wait_file_ready(filepath: Path, timeout: int = 60) -> None:
+    file_busy = True
+    loop_count = 0
+
+    while file_busy:
+        if loop_count >= timeout:
+            raise TimeoutError(f'Klipper is taking too long to release the CSV file ({filepath})!')
+
+        # Try to open the file in write-only mode to check if it is in use
+        # If we successfully open and close the file, it is not in use
+        try:
+            fd = os.open(filepath, os.O_WRONLY)
+            os.close(fd)
+            file_busy = False
+        except OSError:
+            # If OSError is caught, it indicates the file is still being used
+            pass
+        except Exception:
+            # If another exception is raised, it's not a problem, we just loop again
+            pass
+
+        loop_count += 1
+        time.sleep(1)
+
+
+def ensure_folders_exist(folders: list[Path]) -> None:
+    for folder in folders:
+        folder.mkdir(parents=True, exist_ok=True)