Issue #3488638: Improve configuration validation and management

config/install/schemadotorg.settings.yml

...otorg_allowed_formats/schemadotorg_allowed_formats.module

...all/schemadotorg_content_model_documentation.settings.yml

...eld/config/install/schemadotorg_custom_field.settings.yml

...ons/config/install/schemadotorg_descriptions.settings.yml

...nfig/schema/schemadotorg_descriptions.settings.schema.yml

..._diagram/config/install/schemadotorg_diagram.settings.yml

...stall/schemadotorg_entity_reference_override.settings.yml

...roup/config/install/schemadotorg_field_group.settings.yml

...fix/config/install/schemadotorg_field_prefix.settings.yml

...rg_jsonld/config/install/schemadotorg_jsonld.settings.yml

...emadotorg_jsonld_custom/schemadotorg_jsonld_custom.module

..._options/config/install/schemadotorg_options.settings.yml

...ts/schemadotorg/config/snapshot/schemadotorg.settings.yml

...axonomy/config/install/schemadotorg_taxonomy.settings.yml

schemadotorg.install

src/Element/SchemaDotOrgSettings.php

src/Form/SchemaDotOrgSettingsFormBase.php

src/Form/SchemaDotOrgSettingsNamesForm.php

src/Form/SchemaDotOrgSettingsPropertiesForm.php