(Sysadmin): Add guild and user blacklist.

v2 -> v3 data migration for the blacklist tables.
Added blacklists and blacklist commands
Added bot admin level to help groups.

data/migration/v2-v3/migration.sql

@@ -0,0 +1,22 @@
+CREATE TABLE global_user_blacklist(
+  userid BIGINT PRIMARY KEY,
+  ownerid BIGINT NOT NULL,
+  reason TEXT NOT NULL,
+  created_at TIMESTAMPTZ DEFAULT now()
+);
+
+CREATE TABLE global_guild_blacklist(
+  guildid BIGINT PRIMARY KEY,
+  ownerid BIGINT NOT NULL,
+  reason TEXT NOT NULL,
+  created_at TIMESTAMPTZ DEFAULT now()
+);
+
+CREATE TABLE ignored_members(
+  guildid BIGINT NOT NULL,
+  userid BIGINT NOT NULL
+);
+CREATE INDEX ignored_member_guilds ON ignored_members (guildid);
+
+
+INSERT INTO VersionHistory (version, author) VALUES (3, 'v2-v3 Migration');