Refactor to create base classes for table columns that display text

[jattasNI]

Pull Request

🤨 Rationale

As part of the vision described in #1224 in service of #1011 and other column types, we will want to share rendering logic across columns that display their data as text. This could eventually include:

• the existing text column
• the mapping column discussed in Mapping table column spec #1220
• columns that display numbers, dates, elapsed time, and more
• columns defined in applications with custom formatting logic

👩‍💻 Implementation

1. Extract abstract base classes, templates, and styles from the existing text column for:
   • the column custom element
   • the cell view custom element
   • the group header custom element
     These live in table-column/text-base.
2. Derive concrete instances and register custom elements of each of these for the text column
3. Define and use some table field types to provide stricter typing some generic parameters

🧪 Testing

Relying on existing tests.

We have a future task to add docs/examples/tests for applications deriving from these base classes.

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.