Implement text baseline sdf property and changes to vertical Align

[Drulokia]

1. textBaseline Implementation for SDF Renderer

• Fixed textBaseline positioning: Previously, SDF renderer incorrectly used verticalAlign for baseline calculations in getStartConditions.ts
• Added proper textBaseline support with all standard values:
  • 'alphabetic' (default) - baseline at Y coordinate
  • 'top' - top of text bounding box
  • 'middle' - middle of text bounding box
  • 'bottom' - bottom of text bounding box
  • 'hanging' - hanging baseline (96% of ascender)
  • 'ideographic' - ideographic baseline (similar to bottom)

2. Changes to the verticalAlign

• Updated getStartConditions to use textBaseline instead of verticalAlign for baseline calculations
• Enhanced layoutText function to properly handle both properties independently
• Improved vertical alignment calculations that work correctly with textBaseline
• Default verticalAlign is now top

[wouterlucas]

This too will need to be rebased/refactored into #585 as we're not going to continue with the old Text engine implementation