Edit UI - Incremental display of charges total based on changing more than one chargeable field

This ticket is needed for moving COA and COD to the Edit UI changes framework.

For example, a Change filing may now include director changes, which requires an additional chargeable field (fee code).

I'm not sure if this ticket should go under the "move director change" ticket/story or under the "move address change" ticket/story. This ticket is needed for both features, so it should be done at the start of either one.

Start by locating the Edit UI changes framework and the chargeable-field or fee-code handling for COA and COD. Trace how director and address changes currently contribute to the charges total, then confirm the intended shared starting point and verify that changing multiple chargeable fields updates the total incrementally.

Written by the indexing model from the issue text.