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/param.rs

@@ -215,6 +215,9 @@ pub enum Param {
 
     /// For messages: Message text was edited.
     IsEdited = b'L',
+
+    /// For info messages: Contact ID in added or removed to a group.
+    ContactAddedRemoved = b'5',
 }
 
 /// An object for handling key=value parameter lists.