Added default config for registrant fields

modules/recurring_events_registration/config/.DS_Store

...ore.entity_form_display.registrant.registrant.default.yml

...ore.entity_view_display.registrant.registrant.default.yml

...install/field.field.registrant.registrant.field_email.yml

...ll/field.field.registrant.registrant.field_first_name.yml

...all/field.field.registrant.registrant.field_last_name.yml

...install/field.field.registrant.registrant.field_phone.yml

...n/config/install/field.storage.registrant.field_email.yml

...fig/install/field.storage.registrant.field_first_name.yml

...nfig/install/field.storage.registrant.field_last_name.yml

...n/config/install/field.storage.registrant.field_phone.yml