This PR makes it so that horizontal alignment in geo and sticky note
shapes also effects the position of the text within the shape.
<img width="1169" alt="image"
src="https://github.com/tldraw/tldraw/assets/23072548/96b28a7d-0f13-46ba-9ea1-82d02b4f870b">
<img width="1274" alt="image"
src="https://github.com/tldraw/tldraw/assets/23072548/fa768c71-4e9e-4cfe-ad8a-94d7700c445d">
This PR also places the shape's label at the center when there is no
text and the shape is not editing.
### Change Type
- [x] `minor` — New Feature
### Test Plan
1. Create shapes with labels
2. Confirm that their labels are positioned correctly
3. Export the shapes and verify the export
### Release Notes
- Geo shapes and sticky notes now position their labels based on their
alignment.
2a7b2dcdfd