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>

python/tests/test_1_online.py

@@ -1346,7 +1346,7 @@ def test_qr_email_capitalization(acfactory, lp):
     lp.sec("ac1 joins a verified group via a QR code")
     ac1_chat = ac1.qr_join_chat(qr)
     msg = ac1._evtracker.wait_next_incoming_message()
-    assert msg.text == "Member Me ({}) added by {}.".format(ac1.get_config("addr"), ac3.get_config("addr"))
+    assert msg.text == "Member Me added by {}.".format(ac3.get_config("addr"))
     assert len(ac1_chat.get_contacts()) == 2
 
     lp.sec("ac2 joins a verified group via a QR code")