api!: remove Contact.get_name_n_addr() and related APIs

UIs should use display name everywhere and avoid displaying email addresses.

BREAKING CHANGE: dc_contact_get_name_n_addr() CFFI is removed
BREAKING CHANGE: JSON-RPC contact objects don't have nameAndAddr field anymore

deltachat-jsonrpc/src/api/types/contact.rs

@@ -17,7 +17,6 @@ pub struct ContactObject {
     id: u32,
     name: String,
     profile_image: Option<String>, // BLOBS
-    name_and_addr: String,
     is_blocked: bool,
 
     /// Is the contact a key contact.
@@ -57,7 +56,6 @@ impl ContactObject {
             id: contact.id.to_u32(),
             name: contact.get_name().to_owned(),
             profile_image, //BLOBS
-            name_and_addr: contact.get_name_n_addr(),
             is_blocked: contact.is_blocked(),
             is_key_contact: contact.is_key_contact(),
             e2ee_avail: contact.e2ee_avail(context).await?,