core: do not regenerate key when accepting connection to avoid invalidating invitation link on bad networks (#5018)

* core: prepare conn (plan)

* update

* group join

* comment

* comment

* wip

* Revert "wip"

This reverts commit 0849f43377.

* accept

* save contact_id, reuse contact

* refactor

* simplexmq

* set contactUsed

* support retrying join

* exclude prepared connections from API responses

* avoid race with events

* avoid race better

* fix UI

* update library

* tmp

* update

* display error details on ios cmd prohibited

* underscore instead of empty

* Update apps/ios/Shared/Model/SimpleXAPI.swift

Co-authored-by: spaced4ndy <8711996+spaced4ndy@users.noreply.github.com>

* test

* update simplexmq

---------

Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>
Co-authored-by: Diogo <diogofncunha@gmail.com>

src/Simplex/Chat/Migrations/chat_schema.sql

@@ -327,6 +327,7 @@ CREATE TABLE contact_requests(
   peer_chat_min_version INTEGER NOT NULL DEFAULT 1,
   peer_chat_max_version INTEGER NOT NULL DEFAULT 1,
   pq_support INTEGER NOT NULL DEFAULT 0,
+  contact_id INTEGER REFERENCES contacts ON DELETE CASCADE,
   FOREIGN KEY(user_id, local_display_name)
   REFERENCES display_names(user_id, local_display_name)
   ON UPDATE CASCADE
@@ -888,3 +889,4 @@ CREATE INDEX idx_chat_items_fwd_from_chat_item_id ON chat_items(
 CREATE INDEX idx_received_probes_group_member_id on received_probes(
   group_member_id
 );
+CREATE INDEX idx_contact_requests_contact_id ON contact_requests(contact_id);