Billy Huddleston 5085a286bd CAM: Add Units (Metric/Imperial) property to ToolBit
This PR allows each Toolbit to have its own Units property (Metric/Imperial) for better unit management.

Short Summary:
- Adds a Units property (Metric/Imperial) to ToolBit objects for better unit management.
- Ensures ToolBit schema is set and restored properly in the editor and utilities.
- Updates formatting and property handling to respect the selected units.
- Improves the ToolBit editor widget to refresh and sync schema/UI when units change.
- Uses FreeCAD.Units.setSchema and getSchema to switch between unit schemas.

NOTE: Toolbit dimensions are read from JSON in their native units  (as specified by the Units property),
converted to metric for all internal calculations, and displayed in the UI using the
toolbit's selected units. This ensures both accurate internal computation and user-friendly
display, while storing the correct units in the JSON. This can cause some rounding differences
when switching units. Example: 2 mm becomes 0.0787 inches. If you save that as imperial and then
switch back to metric, it will show 1.9999 mm

src/Mod/CAM/Path/Tool/toolbit/models/base.py:
- Add Units property to ToolBit and ensure it's set and synced with toolbit shape parameters.
- Update property creation and value formatting to use Units.

src/Mod/CAM/Path/Tool/toolbit/ui/editor.py:
- Use setToolBitSchema to set schema based on toolbit units.
- Add logic to refresh property editor widget when units change.
- Restore original schema on close.
- Improve docstrings and signal handling.

src/Mod/CAM/Path/Tool/toolbit/util.py:
- Add setToolBitSchema function for robust schema switching.
- Update format_value to use schema and units.
- Add docstrings and clarify formatting logic.

src/Mod/CAM/Path/Tool/library/ui/browser.py:
- Restore original schema after editing toolbit.

src/Mod/CAM/Path/Tool/library/ui/editor.py:
- Ensure correct schema is set for new toolbits.
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