plan: web previews for channels (#7022)

* plan: web previews for channels

* types for recipient side to support channel web previews and domain names

* fix

* migrations

* update schema and api types

* update schema

* rename migrations

* core: check member role

---------

Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>

src/Simplex/Chat/Store/SQLite/Migrations/chat_schema.sql

@@ -125,7 +125,11 @@ CREATE TABLE group_profiles(
   short_descr TEXT,
   group_type TEXT,
   group_link BLOB,
-  public_group_id BLOB
+  public_group_id BLOB,
+  group_web_page TEXT,
+  group_domain TEXT,
+  domain_web_page INTEGER,
+  allow_embedding INTEGER
 ) STRICT;
 CREATE TABLE groups(
   group_id INTEGER PRIMARY KEY, -- local group ID
@@ -778,6 +782,8 @@ CREATE TABLE group_relays(
   conf_id BLOB,
   created_at TEXT NOT NULL DEFAULT(datetime('now')),
   updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+  ,
+  base_web_url TEXT
 ) STRICT;
 CREATE INDEX contact_profiles_index ON contact_profiles(
   display_name,