PL-34 Add module schema and settings

[Kbentham]

https://palantir.atlassian.net/browse/PL-34
Add schema and default settings config to module.
Install the config inspector module and verify that the schema matches the config.

Check out palantirnet/federated-search-demo#5 and use compose to install this branch to test.

[agentrickard]

++

[froboy]

@Kbentham I'm seeing some errors when I pull this up on http://federated-search-demo.local/admin/config/development/configuration/inspect. It looks like there are some schema mismatches on the fields and index. I'm seeing errors in these files:

• core.entity_form_display.taxonomy_term.recipe_category.default (related to federated terms)
• core.entity_form_display.taxonomy_term.tags.default (same)
• field.storage.taxonomy_term.field_federated_terms
• search_api.index.federated_search
• search_api_federated_solr.search_app.settings
  Please try to resolve these errors or let me know if that's not possible.

[Kbentham]

It looks like the schema system include a bit of type checking so i did not include that in the form validation.

[froboy]

Okey doke. Everything is split up and this is reading clean. 🎉