Simple component to show Dynamic Tables

The NWB specification specifies different kinds of data in dynamic tables, i.e. tables in which the columns can be set programmatically.
The content of a Dynamic table can be any: usually strings, numbers or references to other nwb objects (for instance, an epoch may reference time series objects).

For this first version, we don't do anything fancy with references: we simply display the table with the string representation of the object.

- [ ] Implement a backend method on the model interpreter that creates a specific CompositeType for DynamicTable objects.
- [ ] Write a unit test for the above method
- [ ] Add logic to the ModelInterpreter that while sweeping the file adds fields of type DynamicTable to the model
- [ ] Implement React component on the frontend

There are many different examples of dynamic tables in the [nwb test data](https://drive.google.com/drive/folders/1g1CpnoMd9s9L-sHBWVyklp3-xJcLGeFt?usp=sharing); use test_Units.nwb to start. See also https://docs.google.com/spreadsheets/d/1BK7rIA3XoKHV2HhkwoMgq5E6iBGyoQ26LlTiAWT8O4w/edit#gid=0

Start with the ModelInterpreter and the test_Units.nwb data to understand how dynamic tables are represented and swept into the model. Implement and test the backend CompositeType handling, add dynamic-table fields during the file sweep, and build the React component that displays values using their string representation; completion means all four checklist items are covered.

Written by the indexing model from the issue text.