Create `BestBetterExpandingTable` Component to Support Districts Page and Events Page

We'll need a common table component in React that will allow us to generate a table element with a fixed number of columns.

• <name>
• Edit/Save Button (changes according to state)
• Delete (opens pop-up to request confirmation)

Additionally, below the table, there should be an option to "Add" an entry to the table.

The table component should support the following props:

1. tableContents : List; all table element names
2. onUpdate -> Callable; updates the list of table row data following an edit operation, or a confirmed deletion