Create new Annotate1D GUI

[droumis]

Based on the mockup provided in this notebook.

Besides the diagrammed features in sidebar of the screenshot, others feature requests include:

• Table is reactive to changes
• Synced selections between table rows and spans in plot
• Table fields are editable
• Some indicator for unsaved entries (e.g. row-wise background color or at least each row's index col cell.
• Edit button opens modal to (batch) change fields (e.g. 'category') of selected rows

[droumis]

tabulator part of this started in #106