feat: get contact-id for info messages (#6714)

instead of showing addresses in info message, provide an API to get the
contact-id.

UI can then make the info message tappable and open the contact profile
in scope

the corresponding iOS PR - incl. **screencast** - is at
https://github.com/deltachat/deltachat-ios/pull/2652 ; jsonrpc can come
in a subsequent PR when things are settled on android/ios

the number of parameters in `add_info_msg_with_cmd` gets bigger and
bigger, however, i did not want to refactor this in this PR. it is also
not really adding complexity



closes #6702

---------

Co-authored-by: link2xt <link2xt@testrun.org>
Co-authored-by: Hocuri <hocuri@gmx.de>

src/message.rs

@@ -936,6 +936,51 @@ impl Message {
         self.param.get_cmd()
     }
 
+    /// Return the contact ID of the profile to open when tapping the info message.
+    pub async fn get_info_contact_id(&self, context: &Context) -> Result<Option<ContactId>> {
+        match self.param.get_cmd() {
+            SystemMessage::GroupNameChanged
+            | SystemMessage::GroupImageChanged
+            | SystemMessage::EphemeralTimerChanged => {
+                if self.from_id != ContactId::INFO {
+                    Ok(Some(self.from_id))
+                } else {
+                    Ok(None)
+                }
+            }
+
+            SystemMessage::MemberAddedToGroup | SystemMessage::MemberRemovedFromGroup => {
+                if let Some(contact_i32) = self.param.get_int(Param::ContactAddedRemoved) {
+                    let contact_id = ContactId::new(contact_i32.try_into()?);
+                    if contact_id == ContactId::SELF
+                        || Contact::real_exists_by_id(context, contact_id).await?
+                    {
+                        Ok(Some(contact_id))
+                    } else {
+                        Ok(None)
+                    }
+                } else {
+                    Ok(None)
+                }
+            }
+
+            SystemMessage::AutocryptSetupMessage
+            | SystemMessage::SecurejoinMessage
+            | SystemMessage::LocationStreamingEnabled
+            | SystemMessage::LocationOnly
+            | SystemMessage::ChatProtectionEnabled
+            | SystemMessage::ChatProtectionDisabled
+            | SystemMessage::InvalidUnencryptedMail
+            | SystemMessage::SecurejoinWait
+            | SystemMessage::SecurejoinWaitTimeout
+            | SystemMessage::MultiDeviceSync
+            | SystemMessage::WebxdcStatusUpdate
+            | SystemMessage::WebxdcInfoMessage
+            | SystemMessage::IrohNodeAddr
+            | SystemMessage::Unknown => Ok(None),
+        }
+    }
+
     /// Returns true if the message is a system message.
     pub fn is_system_message(&self) -> bool {
         let cmd = self.param.get_cmd();