Create remaining ISO19115-3 reader modules

[rshewitt]

User Story

In order to make the ISO19115-3 reader feature complete, datagov wants to add the remaining reader modules.

Acceptance Criteria

[ACs should be clearly demoable/verifiable whenever possible. Try specifying them using BDD.]

• [ ] GIVEN the ISO19115-3 writer modules
  AND the existing ISO19115-3 reader modules WHEN the remaining modules are identified ( writer modules - reader modules ) THEN those modules will be created
  AND associated data will be added to the main fixture AND tests will be created

Background

• related to #4843
• the ISO19115-3 writer was one of the first writers of MDTranslator. Extensive work had been done on it and is considered feature complete. Considering this, there should be about a 1:1 relationship between modules in the writer and the reader.

Security Considerations (required)

[Any security concerns that might be implicated in the change. "None" is OK, just be explicit here!]

Sketch

• get the list of writer modules, get the list of reader modules, get the remaining modules that need to created for the reader.