chore: move migrations to rust

also adds some basic test seed data

crates/migrate/data/migrations/51.sql

@@ -0,0 +1,7 @@
+-- database version 51
+--
+-- add guild setting for SUPPRESS_NOTIFICATIONS message flag on proxied messages
+
+alter table servers add column suppress_notifications bool not null default false;
+
+update info set schema_version = 51;