Issue #1983894 by vijaycs85, swastik1608, hussainweb: Provide config schema to...

Issue #1983894 by vijaycs85, swastik1608, hussainweb: Provide config schema to field types and storage in email module.

core/modules/email/config/schema/email.schema.yml

+# Schema for the configuration files of the Email module.
+
+field.email.settings:
+  type: sequence
+  label: 'E-mail settings'
+  sequence:
+    - type: string
+
+field.email.instance_settings:
+  type: sequence
+  label: 'E-mail settings'
+  sequence:
+    - type: string
+      label: 'Setting'
+
+field.email.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: email
+          label: 'Value'