Implement contact plugins

core/base/src/main/java/de/mm20/launcher2/search/Contact.kt

@@ -19,6 +19,9 @@ interface Contact : SavableSearchable {
     val postalAddresses: List<PostalAddress>
     val customActions: List<CustomContactAction>
 
+    override val label: String
+        get() = name
+
     val summary: String
         get() {
             return (phoneNumbers.map { it.number } + emailAddresses.map { it.address })

core/shared/src/main/java/de/mm20/launcher2/plugin/contracts/ContactPluginContract.kt

@@ -12,17 +12,41 @@ abstract class ContactPluginContract {
          */
         val Id = column<String>("id")
 
+        /**
+         * Uri to view the contact.
+         */
+        val Uri = column<String>("uri")
+
         /**
          * The display name of the contact.
          * First name + last name, if applicable.
          */
         val Name = column<String>("name")
 
+        /**
+         * List of phone numbers associated with the contact.
+         */
         val PhoneNumbers = column<List<PhoneNumber>>("phone_numbers")
+
+
+        /**
+         * List of email addresses associated with the contact.
+         */
         val EmailAddresses = column<List<EmailAddress>>("email_addresses")
+
+        /**
+         * List of postal addresses associated with the contact.
+         */
         val PostalAddresses = column<List<PostalAddress>>("postal_addresses")
+
+        /**
+         * List of custom actions associated with the contact.
+         */
         val CustomActions = column<List<CustomContactAction>>("custom_actions")
 
+        /**
+         * Uri to the contact's photo.
+         */
         val PhotoUri = column<String>("photo_uri")
     }
 }